Develop Reference

Unable to Find Control in RowEditing event for TemplateFields in GridView

I am adding columns to gridview from codebehind.
For boundfields, i am able to find control and textbox value while updating the row.
But for template fields, i am not able to get controls to the code behind, so i am unable to get the textbox value.
Can please suggest how to get textbox value in codebehind for template fields
My Code
protected void gvbind()
{
conn.Open();
string Query = "SELECT * FROM testactiondatabase_db.actions";
MySqlCommand MyCommand2 = new MySqlCommand(Query, conn);
MySqlDataAdapter MyAdapter = new MySqlDataAdapter();
MyAdapter.SelectCommand = MyCommand2;
DataTable dt = new DataTable();
MyAdapter.Fill(dt);
TaskGridView.Columns.Clear();
for (int i = 0; i < dt.Columns.Count; i++)
{
if (dt.Columns[i].ColumnName.ToString().ToUpper().Contains("DATE"))
{
TemplateField bfield = new TemplateField();
bfield.HeaderTemplate = new GridViewTemplate(ListItemType.Header, dt.Columns[i].ColumnName.ToString());
bfield.ItemTemplate = new GridViewTemplate(ListItemType.Item, dt.Columns[i].ColumnName.ToString());
bfield.EditItemTemplate = new GridViewTemplate(ListItemType.EditItem, dt.Columns[i].ColumnName.ToString());
TaskGridView.Columns.Add(bfield);
}
else
{
BoundField boundfield = new BoundField();
boundfield.DataField = dt.Columns[i].ColumnName.ToString();
boundfield.HeaderText = dt.Columns[i].ColumnName.ToString();
TaskGridView.Columns.Add(boundfield);
}
}
TaskGridView.DataSource = dt;
TaskGridView.DataBind();
TaskGridView.Width = 600;
TaskGridView.HeaderStyle.CssClass = "header";
TaskGridView.RowStyle.CssClass = "rowstyle";
conn.Close();
}
public class GridViewTemplate : ITemplate
{
ListItemType _templateType;
string _columnName;
public GridViewTemplate(ListItemType type, string colname)
{
_templateType = type;
_columnName = colname;
}
void ITemplate.InstantiateIn(System.Web.UI.Control container)
{
switch (_templateType)
{
case ListItemType.Header:
Label lbl = new Label();
lbl.Text = _columnName;
container.Controls.Add(lbl);
break;
case ListItemType.Item:
Label lb1 = new Label();
lb1.DataBinding += new EventHandler(lb1_DataBinding);
container.Controls.Add(lb1);
break;
case ListItemType.EditItem:
TextBox tb1 = new TextBox();
tb1.ID = _columnName;
tb1.DataBinding += new EventHandler(tb1_DataBinding);
tb1.Attributes.Add("class", "myDatePickerClass");
container.Controls.Add(tb1);
break;
case ListItemType.Footer:
CheckBox chkColumn = new CheckBox();
chkColumn.ID = "Chk" + _columnName;
container.Controls.Add(chkColumn);
break;
}
}
void tb1_DataBinding(object sender, EventArgs e)
{
TextBox txtdata = (TextBox)sender;
GridViewRow container = (GridViewRow)txtdata.NamingContainer;
object dataValue = DataBinder.Eval(container.DataItem, _columnName);
if (dataValue != DBNull.Value)
{
txtdata.Text = Convert.ToDateTime(dataValue.ToString()).ToString("dd/MM/yyyy");
}
}
void lb1_DataBinding(object sender, EventArgs e)
{
Label txtdata = (Label)sender;
GridViewRow container = (GridViewRow)txtdata.NamingContainer;
object dataValue = DataBinder.Eval(container.DataItem, _columnName);
if (dataValue != DBNull.Value)
{
txtdata.Text = Convert.ToDateTime(dataValue.ToString()).ToString("dd/MM/yyyy");
}
}
}
I am using the following code for reading the template field textbox value while updating the row but the controls are 0 for the cell.
GridViewRow row = (GridViewRow)TaskGridView.Rows[e.RowIndex];
TextBox textnew = (TextBox)row.Cells[j].Controls[0];

Try using FindControl.
TextBox textnew = TaskGridView.Rows[e.RowIndex].FindControl(_columnName) as TextBox;
But if I use your snippet like this, with setting an EditIndex manually, it also works... The value of te TextBox is Cell 1 is changed.
TaskGridView.EditIndex = 1;
TaskGridView.DataSource = dt;
TaskGridView.DataBind();
TaskGridView.Width = 600;
TaskGridView.HeaderStyle.CssClass = "header";
TaskGridView.RowStyle.CssClass = "rowstyle";
GridViewRow row = (GridViewRow)TaskGridView.Rows[TaskGridView.EditIndex];
TextBox textnew = (TextBox)row.Cells[1].Controls[0];
textnew.Text = "test";

Dynamically added button on dynamically created button click event not firing

I have a button which is created from a MySQL query result. It looks like this:
1 Product name |add to basket|
And when I press the "add to basket" button, the product appears in a table on the right side(basket). Like this:
1 Product name |remove|
But for some reason, the remove button click-event removes all items from basket. When I press add to basket again, all items appear in the basket again.
This is whole class. Thank you for your help
public partial class neworder : System.Web.UI.Page
{
Basket basket;
Table BasketTable;
private int countRows = 0;
private string distance;
private string categories;
ArrayList categoryList = new ArrayList();
ArrayList productList = new ArrayList();
private string products = "";
public string Products
{
get { return products; }
set { products = value; }
}
public string Categories
{
get { return categories; }
set { categories = value; }
}
public string Distance
{
get { return distance; }
set { distance = value; }
}
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Page_Init(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
basket = new Basket();
Session["basket"] = basket;
}
populateCategories();
populateProducts();
loadBasket(); // if this is comment then i items are added fine
//to basket but cant be remove, if its not commented then i can add
//only 2 items in basket
}
private void populateCategories()
{
using (MySqlConnection cn = new MySqlConnection(Static.MysqlServer1))
{
cn.Open();
String strSQL = "SELECT category_name FROM categories;";
MySqlCommand cmdPLT = new MySqlCommand(strSQL, cn);
MySqlDataReader myReader;
myReader = cmdPLT.ExecuteReader();
while (myReader.Read())
{
string cat = myReader.GetString(0);
categoryList.Add(cat);
categories += "" + cat + "<br />";
}
}
}
private void populateProducts()
{
Panel1.Controls.Clear();
string tem = "";
foreach (string s in categoryList)
{
Table tableTitle = new Table();
TableRow row1 = new TableRow();
tableTitle.ID = s + "Title";
tableTitle.CssClass = "rest2";
Panel1.Controls.Add(tableTitle);
TableCell cell2 = new TableCell();
Label label2 = new Label();
label2.Text = "<a name="+s+">"+s+"</a>";
label2.ID = "TitleText_" + s;
cell2.Controls.Add(label2);
row1.Cells.Add(cell2);
tableTitle.Controls.Add(row1);
Table table = new Table();
table.ID = s;
table.CssClass = "rest";
Panel1.Controls.Add(table);
using (MySqlConnection cn = new MySqlConnection(Static.MysqlServer1))
{
string name = "";
string size = "";
int id = -1;
double price = 0.0;
cn.Open();
String strSQL = "SELECT product_id, product_name, product_price, product_size FROM products join categories on categories.CATEGORY_ID = products.CATEGORY_ID where category_name ='" + s + "' order by product_order asc;";
MySqlCommand cmdPLT = new MySqlCommand(strSQL, cn);
MySqlDataReader myReader;
myReader = cmdPLT.ExecuteReader();
while (myReader.Read())
{
name = (string)myReader["product_name"];
id = (int)myReader["product_id"];
size = (string)myReader["product_size"];
price = (double)myReader["product_price"];
productList.Add(new Products(id, name, size, price));
GenerateRow(s, name, size, price, table, id);
}
if (!tem.Equals(""))
{
tem += "</table>";
}
}
products += tem;
tem = "";
}
}
private void GenerateRow(string category, string name, string size, double price, Table table,int id )
{
TableRow row1 = new TableRow();
//ROW 1 NAME
TableCell cell1 = new TableCell();
Label label1 = new Label();
label1.Text = name;
cell1.Style.Add("width", "300px !important");
label1.ID = "NameText_" + category+id;
cell1.Controls.Add(label1);
row1.Cells.Add(cell1);
//ROW 2 Size
TableCell cell2 = new TableCell();
Label label2 = new Label();
cell2.Style.Add("width", "100px !important");
label2.Text = size;
label2.ID = "SizeText_" +category+ id;
cell2.Controls.Add(label2);
row1.Cells.Add(cell2);
//ROW 1 PRICE
TableCell cell3 = new TableCell();
Label label3 = new Label();
cell3.Style.Add("width", "60px !important");
label3.Text = "" + price;
label3.ID = "Price_" + category + id;
cell3.Controls.Add(label3);
row1.Cells.Add(cell3);
//ROW 1 BUTTON
TableCell cell4 = new TableCell();
cell4.Style.Add("height", "25px !important");
Button button = new Button();
button.Text = "+";
button.Click += button_Click;
button.ID = ""+id;
cell4.Controls.Add(button);
row1.Cells.Add(cell4);
table.Controls.Add(row1);
}
private void loadBasket()
{
Basket temp = (Basket)Session["basket"];
BasketTable = new Table();
BasketTable.ID = "basket";
BasketTable.CssClass = "rest";
PanelBasket.Controls.Clear();
PanelBasket.Controls.Add(BasketTable);
foreach (Products p in temp.ProductList)
{
TableRow row1 = new TableRow();
//ROW 1 NAME
TableCell cell1 = new TableCell();
Label label1 = new Label();
label1.Text = p.Name;
cell1.Style.Add("width", "100px !important");
label1.ID = p.Name;
cell1.Controls.Add(label1);
row1.Cells.Add(cell1);
//ROW 2 Size
TableCell cell2 = new TableCell();
Label label2 = new Label();
cell2.Style.Add("width", "40px !important");
label2.Text = p.Size;
label2.ID = p.Size;
cell2.Controls.Add(label2);
row1.Cells.Add(cell2);
//ROW 1 PRICE
TableCell cell3 = new TableCell();
Label label3 = new Label();
cell3.Style.Add("width", "60px !important");
label3.Text = p.Price+"";
label3.ID = p.Price + "";
cell3.Controls.Add(label3);
row1.Cells.Add(cell3);
//ROW 1 BUTTON
TableCell cell4 = new TableCell();
cell4.Style.Add("height", "25px !important");
Button remove = new Button();
remove.Text = "-";
remove.Click += new EventHandler(button99_Click);
remove.ID = "remove" + p.Id;
cell4.Controls.Add(remove);
row1.Cells.Add(cell4);
BasketTable.Controls.Add(row1);
}
}
private void button_Click(object sender, EventArgs e)
{
Button button = (Button)sender;
string buttonId = button.ID;
foreach (Products p in productList)
{
if (p.Id == Convert.ToInt32(buttonId))
{
Basket temp = (Basket)Session["basket"];
temp.addPruduct(p);
Session["basket"] = temp;
loadBasket();
Label1.Text = temp.ProductList.Count + "";
}
}
}
protected void remove_Click(object sender, EventArgs e)
{
Label1.Text = "test";
}
}

how to use repeater iteratively?

I have one repeater which displays the list of puja.i have also used one datalist to display the names of temples.whenever i click on search it displays only the last value of the repeater i.e it is taking only the last value of the repeater....my question is how to use loop inside a repeater???
here is my code behind how i used datalist and repeater:
protected void Page_Load(object sender, EventArgs e)
{
//lblnodatafound.Visible = true;
//lbldatafound.Visible = false;
if (Request.QueryString["search"] != null)
{
var dt = new DataTable("Data");
String source = Request.QueryString["search"];
var splitseparator = new string[] { " " };
String[] result = source.Split(splitseparator, StringSplitOptions.RemoveEmptyEntries);
foreach (String s in result)
{
if (IsAlphaNumeric(s) == true)
{
var dttemp = new DataTable();
dttemp = fnsearch(s);
dt.Merge(dttemp, true);
}
}
if (dt.Rows.Count != 0)
{
int count = dt.Rows.Count;
if (dt.Rows.Count > 0)
{
DataList1.DataSource = dt;
DataList1.DataBind();
lblnodatafound.Visible = false;
lbldatafound.Visible = true;
//added the repeater to display the list of puja
for (int i = 0; i < dt.Rows.Count; i++)
{
String id = dt.Rows[i]["id"].ToString();
string query = "select puja.id,puja.name as puja_name, mandir.name as mandir_name from puja,mandir where mandir.id= puja.with_mandir and puja.with_mandir = '" + id + "'";
conn.Open();
MySqlCommand cmd = new MySqlCommand(query, conn);
MySqlDataAdapter adp = new MySqlDataAdapter(cmd);
DataTable dt1 = new DataTable();
adp.Fill(dt1);
conn.Close();
if (dt1.Rows.Count > 0)
{
lblmandirpuja.Text = "Poja in " + dt1.Rows[0]["mandir_name"];
foreach (RepeaterItem repeatItem in Repeater1.Items){
Repeater1.DataSource = dt1;
Repeater1.DataBind();
}
}
}
}
}
else
{
lblnodatafound.Visible = true;
lbldatafound.Visible=false;
}
}
}

Try to change this line:
if (dt1.Rows.Count > 0)
for something like:
for(int i = 0; i < dt1.Rows.Count; i++)
And this one:
lblmandirpuja.Text = "Poja in " + dt1.Rows[0]["mandir_name"];
The 0 for the i:
lblmandirpuja.Text = "Poja in " + dt1.Rows[i]["mandir_name"];

Dynamically recreating controls on postback for each row of table (ASP.NET/C#)

For every row in my 'table' I am manually creating, there must be a LinkButton to delete a database row that matches a column in the table. Because no 2 controls can have the same name, I've had to use a GUID to name them so they're all unique.
Problem is, right now when I click Delete, the page posts back with no changes, but I've been told that I need to recreate the controls - but how do I recreate them in Page_Load when their ID's are randomly generated? Here's my code:
Table table = new Table();
table.GridLines = GridLines.None;
//table.BorderWidth = 1;
//table.BorderColor = (System.Drawing.Color)conv.ConvertFromString("black");
table.Width = Unit.Percentage(100);
table.GridLines = (GridLines)3;
TableHeaderRow header = new TableHeaderRow();
header.BackColor = (System.Drawing.Color)conv.ConvertFromString("#EDEDED");
foreach (string header2 in new string[] {"", "Quantity", "Rate", "Description", "Nominal Code", "Subtotal" })
{
TableCell cell = new TableCell();
cell.Text = header2;
header.Cells.Add(cell);
}
table.Rows.Add(header);
var data = (from s in dc.InvoiceItems where s.invoiceid.ToString() == Request.QueryString["id"].ToString() select s);
foreach (var x in data)
{
TableRow row = new TableRow();
if (x.invoicetext == null)
{
decimal total;
try
{
total = (decimal)x.rate * (decimal)x.quantity;
}
catch
{
total = 0;
}
int i = 0;
foreach (string columnData in new string[] {x.id.ToString(), x.quantity.ToString(), x.rate.ToString(), x.description, x.nominalcode, total.ToString("N2") })
{
TableCell cell = new TableCell();
{
if (i == 0)
{
LinkButton lnkdel = new LinkButton();
lnkdel.Text = "Delete";
lnkdel.ID = "lnkDel" + Guid.NewGuid();
if (alloweditting == false)
{
lnkdel.Enabled = false;
}
lnkdel.Font.Bold = false;
lnkdel.CommandArgument = x.id.ToString();
lnkdel.Command += (s, e2) =>
{
using (SqlConnection conn = new SqlConnection(connection))
{
SqlCommand comm = new SqlCommand("DELETE FROM InvoiceItem WHERE id = #id", conn);
comm.Parameters.AddWithValue("#id", e2.CommandArgument);
conn.Open();
try
{
comm.ExecuteNonQuery();
}
catch (Exception ex)
{
Response.Write(ex);
}
}
};
cell.Controls.Add(lnkdel);
i++;
}
else
{
cell.Text = columnData;
}
}
row.Cells.Add(cell);
}
runningtotal = runningtotal + total;
}
else
{
int i = 0;
foreach (string columnData in new string[] {x.id.ToString(), x.invoicetext })
{
TableCell cell = new TableCell();
if (i == 0)
{
LinkButton lnkdel = new LinkButton();
lnkdel.Text = "Delete";
lnkdel.ID = "lnkDel" + Guid.NewGuid();
if (alloweditting == false)
{
lnkdel.Enabled = false;
}
lnkdel.Font.Bold = false;
lnkdel.CommandArgument = x.id.ToString();
rowid = lnkdel.CommandArgument;
lnkdel.Command += (s, e2) =>
{
using (SqlConnection conn = new SqlConnection(connection))
{
SqlCommand comm = new SqlCommand("DELETE FROM InvoiceItem WHERE id = #id", conn);
comm.Parameters.AddWithValue("#id", rowid);
conn.Open();
try
{
comm.ExecuteNonQuery();
}
catch (Exception ex)
{
Response.Write(ex);
}
}
};
cell.Controls.Add(lnkdel);
i++;
}
else
{
cell.Text = columnData;
cell.ColumnSpan = 5;
}
row.Cells.Add(cell);
}
}
switch (x.formatoptions)
{
case 1:
row.ForeColor = (System.Drawing.Color)conv.ConvertFromString("black");
row.Font.Bold = false;
break;
case 2:
row.ForeColor = (System.Drawing.Color)conv.ConvertFromString("black");
row.Font.Bold = true;
break;
case 3:
row.ForeColor = (System.Drawing.Color)conv.ConvertFromString("red");
row.Font.Bold = false;
break;
case 4:
row.ForeColor = (System.Drawing.Color)conv.ConvertFromString("red");
row.Font.Bold = true;
break;
}
table.Rows.Add(row);
}
TableFooterRow row2 = new TableFooterRow();
TableCell cell2 = new TableCell();
cell2.Text = "<span style\"text-align: right; width: 100%;\">Total = <b>" + runningtotal.ToString("N2") + "</b></span>";
cell2.ColumnSpan = 6;
row2.Cells.Add(cell2);
table.Rows.Add(row2);
var update = (from s in dc.Invoices where s.id.ToString() == Request.QueryString["id"] select s).Single();
update.total = runningtotal;
dc.SubmitChanges();
datatable.Controls.Clear();
datatable.Controls.Add(table);
}

Don't use a GUID. Make the ID value from the rowid, so it's a repeatable value like "row_784".
For example, instead of
lnkdel.ID = "lnkDel" + Guid.NewGuid();
use
lnkdel.ID = "lnkDel" + x.id.ToString();

You need to create them in Page_Init, not Page_Load. You should only need to move the call to the code that creates your table to Page_Init, and everything should work as you expect.

c# Counter requires 2 button clicks to update

I have a problem that has been bugging me all day.
In my code I have the following:
private int rowCount
{
get { return (int)ViewState["rowCount"]; }
set { ViewState["rowCount"] = value; }
}
and a button event
protected void addRow_Click(object sender, EventArgs e)
{
rowCount = rowCount + 1;
}
Then on Page_Load I read that value and create controls accordingly.
I understand the button event fires AFTER the Page_Load fires so the value isn't updated until the next postback. Real nightmare.
Here's the entire code:
protected void Page_Load(object sender, EventArgs e)
{
string xmlValue = ""; //To read a value from a database
if (xmlValue.Length > 0)
{
if (!Page.IsPostBack)
{
DataSet ds = XMLToDataSet(xmlValue);
Table dimensionsTable = DataSetToTable(ds);
tablePanel.Controls.Add(dimensionsTable);
DataTable dt = ds.Tables["Dimensions"];
rowCount = dt.Rows.Count;
colCount = dt.Columns.Count;
}
else
{
tablePanel.Controls.Add(DataSetToTable(DefaultDataSet(rowCount, colCount)));
}
}
else
{
if (!Page.IsPostBack)
{
rowCount = 2;
colCount = 4;
}
tablePanel.Controls.Add(DataSetToTable(DefaultDataSet(rowCount, colCount)));
}
}
protected void submit_Click(object sender, EventArgs e)
{
resultsLabel.Text = Server.HtmlEncode(DataSetToStringXML(TableToDataSet((Table)tablePanel.Controls[0])));
}
protected void addColumn_Click(object sender, EventArgs e)
{
colCount = colCount + 1;
}
protected void addRow_Click(object sender, EventArgs e)
{
rowCount = rowCount + 1;
}
public DataSet TableToDataSet(Table table)
{
DataSet ds = new DataSet();
DataTable dt = new DataTable("Dimensions");
ds.Tables.Add(dt);
//Add headers
for (int i = 0; i < table.Rows[0].Cells.Count; i++)
{
DataColumn col = new DataColumn();
TextBox headerTxtBox = (TextBox)table.Rows[0].Cells[i].Controls[0];
col.ColumnName = headerTxtBox.Text;
col.Caption = headerTxtBox.Text;
dt.Columns.Add(col);
}
for (int i = 0; i < table.Rows.Count; i++)
{
DataRow valueRow = dt.NewRow();
for (int x = 0; x < table.Rows[i].Cells.Count; x++)
{
TextBox valueTextBox = (TextBox)table.Rows[i].Cells[x].Controls[0];
valueRow[x] = valueTextBox.Text;
}
dt.Rows.Add(valueRow);
}
return ds;
}
public Table DataSetToTable(DataSet ds)
{
DataTable dt = ds.Tables["Dimensions"];
Table newTable = new Table();
//Add headers
TableRow headerRow = new TableRow();
for (int i = 0; i < dt.Columns.Count; i++)
{
TableCell headerCell = new TableCell();
TextBox headerTxtBox = new TextBox();
headerTxtBox.ID = "HeadersTxtBox" + i.ToString();
headerTxtBox.Font.Bold = true;
headerTxtBox.Text = dt.Columns[i].ColumnName;
headerCell.Controls.Add(headerTxtBox);
headerRow.Cells.Add(headerCell);
}
newTable.Rows.Add(headerRow);
//Add value rows
for (int i = 0; i < dt.Rows.Count; i++)
{
TableRow valueRow = new TableRow();
for (int x = 0; x < dt.Columns.Count; x++)
{
TableCell valueCell = new TableCell();
TextBox valueTxtBox = new TextBox();
valueTxtBox.ID = "ValueTxtBox" + i.ToString() + i + x + x.ToString();
valueTxtBox.Text = dt.Rows[i][x].ToString();
valueCell.Controls.Add(valueTxtBox);
valueRow.Cells.Add(valueCell);
}
newTable.Rows.Add(valueRow);
}
return newTable;
}
public DataSet DefaultDataSet(int rows, int cols)
{
DataSet ds = new DataSet();
DataTable dt = new DataTable("Dimensions");
ds.Tables.Add(dt);
DataColumn nameCol = new DataColumn();
nameCol.Caption = "Name";
nameCol.ColumnName = "Name";
nameCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(nameCol);
DataColumn widthCol = new DataColumn();
widthCol.Caption = "Width";
widthCol.ColumnName = "Width";
widthCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(widthCol);
if (cols > 2)
{
DataColumn heightCol = new DataColumn();
heightCol.Caption = "Height";
heightCol.ColumnName = "Height";
heightCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(heightCol);
}
if (cols > 3)
{
DataColumn depthCol = new DataColumn();
depthCol.Caption = "Depth";
depthCol.ColumnName = "Depth";
depthCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(depthCol);
}
if (cols > 4)
{
int newColCount = cols - 4;
for (int i = 0; i < newColCount; i++)
{
DataColumn newCol = new DataColumn();
newCol.Caption = "New " + i.ToString();
newCol.ColumnName = "New " + i.ToString();
newCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(newCol);
}
}
for (int i = 0; i < rows; i++)
{
DataRow newRow = dt.NewRow();
newRow["Name"] = "Name " + i.ToString();
newRow["Width"] = "Width " + i.ToString();
if (cols > 2)
{
newRow["Height"] = "Height " + i.ToString();
}
if (cols > 3)
{
newRow["Depth"] = "Depth " + i.ToString();
}
dt.Rows.Add(newRow);
}
return ds;
}
public DataSet XMLToDataSet(string xml)
{
StringReader sr = new StringReader(xml);
DataSet ds = new DataSet();
ds.ReadXml(sr);
return ds;
}
public string DataSetToStringXML(DataSet ds)
{
XmlDocument _XMLDoc = new XmlDocument();
_XMLDoc.LoadXml(ds.GetXml());
StringWriter sw = new StringWriter();
XmlTextWriter xw = new XmlTextWriter(sw);
XmlDocument xml = _XMLDoc;
xml.WriteTo(xw);
return sw.ToString();
}
private int rowCount
{
get { return (int)ViewState["rowCount"]; }
set { ViewState["rowCount"] = value; }
}
private int colCount
{
get { return (int)ViewState["colCount"]; }
set { ViewState["colCount"] = value; }
}
EDIT: Here's my .aspx as well in case you want to try it out in VS.
<asp:Panel ID="tablePanel" runat="server" CssClass="table-panel" />
<asp:Label ID="resultsLabel" runat="server" />
<asp:LinkButton ID="submit" Text="submit" runat="server" onclick="submit_Click" />
<asp:LinkButton ID="addColumn" Text="Add Column" runat="server"
onclick="addColumn_Click" />
<asp:LinkButton ID="addRow" Text="Add Row" runat="server" onclick="addRow_Click" />
Thanks in advance,
Marko

Just as I recommended in this other question, if you'd like some page logic to execute AFTER the buttons' Click event, put that code into the Page_PreRender instead.
You can read more about it here: ASP.NET page life cycle.
EDIT:
After examining your code more closely, I see that you add stuff and create new controls, which is not a good idea in the PreRender event.
Instead, put the code into a separate method. In the Page_Load, check if it is a postback and handle the case when it isn't.
In the buttons' click evnt, also add a call to that new method. (thus handling the IsPostback == true case)

OK I've solved the problem by following instructions in this post.
Here's my final code - feel free to use it if you ever need to create dynamic controls based on a counter.
Also I wouldn't mind feedback on the overall coding style, I always appreciate others' input.
protected void Page_Load(object sender, EventArgs e)
{
string xmlValue = ""; //To read a value from a database
if (xmlValue.Length > 0)
{
if (!Page.IsPostBack)
{
DataSet ds = XMLToDataSet(xmlValue);
Table dimensionsTable = DataSetToTable(ds);
tablePanel.Controls.Add(dimensionsTable);
DataTable dt = ds.Tables["Dimensions"];
rowCount = dt.Rows.Count;
colCount = dt.Columns.Count;
}
else
{
tablePanel.Controls.Add(DataSetToTable(DefaultDataSet(rowCount, colCount)));
}
}
else
{
if (!Page.IsPostBack)
{
rowCount = 2;
colCount = 4;
}
else
{
if (GetPostBackControl(this.Page).ID == "addRow")
{
rowCount = rowCount + 1;
}
else if (GetPostBackControl(this.Page).ID == "addColumn")
{
colCount = colCount + 1;
}
}
tablePanel.Controls.Add(DataSetToTable(DefaultDataSet(rowCount, colCount)));
}
}
protected void submit_Click(object sender, EventArgs e)
{
resultsLabel.Text = Server.HtmlEncode(DataSetToStringXML(TableToDataSet((Table)tablePanel.Controls[0])));
}
protected void addColumn_Click(object sender, EventArgs e)
{
}
protected void addRow_Click(object sender, EventArgs e)
{
}
public DataSet TableToDataSet(Table table)
{
DataSet ds = new DataSet();
DataTable dt = new DataTable("Dimensions");
ds.Tables.Add(dt);
//Add headers
for (int i = 0; i < table.Rows[0].Cells.Count; i++)
{
DataColumn col = new DataColumn();
TextBox headerTxtBox = (TextBox)table.Rows[0].Cells[i].Controls[0];
col.ColumnName = headerTxtBox.Text;
col.Caption = headerTxtBox.Text;
dt.Columns.Add(col);
}
for (int i = 0; i < table.Rows.Count; i++)
{
DataRow valueRow = dt.NewRow();
for (int x = 0; x < table.Rows[i].Cells.Count; x++)
{
TextBox valueTextBox = (TextBox)table.Rows[i].Cells[x].Controls[0];
valueRow[x] = valueTextBox.Text;
}
dt.Rows.Add(valueRow);
}
return ds;
}
public Table DataSetToTable(DataSet ds)
{
DataTable dt = ds.Tables["Dimensions"];
Table newTable = new Table();
//Add headers
TableRow headerRow = new TableRow();
for (int i = 0; i < dt.Columns.Count; i++)
{
TableCell headerCell = new TableCell();
TextBox headerTxtBox = new TextBox();
headerTxtBox.ID = "HeadersTxtBox" + i.ToString();
headerTxtBox.Font.Bold = true;
headerTxtBox.Text = dt.Columns[i].ColumnName;
headerCell.Controls.Add(headerTxtBox);
headerRow.Cells.Add(headerCell);
}
newTable.Rows.Add(headerRow);
//Add value rows
for (int i = 0; i < dt.Rows.Count; i++)
{
TableRow valueRow = new TableRow();
for (int x = 0; x < dt.Columns.Count; x++)
{
TableCell valueCell = new TableCell();
TextBox valueTxtBox = new TextBox();
valueTxtBox.ID = "ValueTxtBox" + i.ToString() + i + x + x.ToString();
valueTxtBox.Text = dt.Rows[i][x].ToString();
valueCell.Controls.Add(valueTxtBox);
valueRow.Cells.Add(valueCell);
}
newTable.Rows.Add(valueRow);
}
return newTable;
}
public DataSet DefaultDataSet(int rows, int cols)
{
DataSet ds = new DataSet();
DataTable dt = new DataTable("Dimensions");
ds.Tables.Add(dt);
DataColumn nameCol = new DataColumn();
nameCol.Caption = "Name";
nameCol.ColumnName = "Name";
nameCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(nameCol);
DataColumn widthCol = new DataColumn();
widthCol.Caption = "Width";
widthCol.ColumnName = "Width";
widthCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(widthCol);
if (cols > 2)
{
DataColumn heightCol = new DataColumn();
heightCol.Caption = "Height";
heightCol.ColumnName = "Height";
heightCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(heightCol);
}
if (cols > 3)
{
DataColumn depthCol = new DataColumn();
depthCol.Caption = "Depth";
depthCol.ColumnName = "Depth";
depthCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(depthCol);
}
if (cols > 4)
{
int newColCount = cols - 4;
for (int i = 0; i < newColCount; i++)
{
DataColumn newCol = new DataColumn();
newCol.Caption = "New " + i.ToString();
newCol.ColumnName = "New " + i.ToString();
newCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(newCol);
}
}
for (int i = 0; i < rows; i++)
{
DataRow newRow = dt.NewRow();
newRow["Name"] = "Name " + i.ToString();
newRow["Width"] = "Width " + i.ToString();
if (cols > 2)
{
newRow["Height"] = "Height " + i.ToString();
}
if (cols > 3)
{
newRow["Depth"] = "Depth " + i.ToString();
}
dt.Rows.Add(newRow);
}
return ds;
}
public DataSet XMLToDataSet(string xml)
{
StringReader sr = new StringReader(xml);
DataSet ds = new DataSet();
ds.ReadXml(sr);
return ds;
}
public string DataSetToStringXML(DataSet ds)
{
XmlDocument _XMLDoc = new XmlDocument();
_XMLDoc.LoadXml(ds.GetXml());
StringWriter sw = new StringWriter();
XmlTextWriter xw = new XmlTextWriter(sw);
XmlDocument xml = _XMLDoc;
xml.WriteTo(xw);
return sw.ToString();
}
private int rowCount
{
get { return (int)ViewState["rowCount"]; }
set { ViewState["rowCount"] = value; }
}
private int colCount
{
get { return (int)ViewState["colCount"]; }
set { ViewState["colCount"] = value; }
}
public static Control GetPostBackControl(Page page)
{
Control control = null;
string ctrlname = page.Request.Params.Get("__EVENTTARGET");
if (ctrlname != null && ctrlname != string.Empty)
{
control = page.FindControl(ctrlname);
}
else
{
foreach (string ctl in page.Request.Form)
{
Control c = page.FindControl(ctl);
if (c is System.Web.UI.WebControls.Button)
{
control = c;
break;
}
}
}
return control;
}

move this code:
tablePanel.Controls.Add(DataSetToTable(DefaultDataSet(rowCount, colC....
To the prerender event to make the table bind to its data after the button click fired.