Develop Reference

How To select Particular Cell Value in Grid View

I want to select Particular Cell value and will use to Bind Controls But i am Not able to select Cell Value
Its not retrieving data
ASPX Code
<asp:GridView ID="grdLogedUserDetails" OnRowDeleting="grdLogedUserDetails_RowDeleting" OnRowDataBound="grdLogedUserDetails_RowDataBound"
runat="server" Style="width: 100%; text-align: center" OnRowCommand="grdLogedUserDetails_RowCommand"
class="table table-striped table-bordered" AutoGenerateColumns="false" datakeynames="Ref_ID">
<Columns>
<asp:TemplateField HeaderText="Process No">
<ItemTemplate>
<asp:Label runat="server" Text='<%# Bind("Ref_ID") %>' ID="lblRef_ID"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Company">
<ItemTemplate>
<asp:Label runat="server" Text='<%# Bind("CompanyName") %>' ID="lblCompanyName"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Division">
<ItemTemplate>
<asp:Label runat="server" Text='<%# Bind("DivisionName") %>' ID="lblDivisionName"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:ImageButton ID="imgDel" runat="server" ImageUrl="~/Images/delete.png" AlternateText="Delete" CommandName="Delete" />
</ItemTemplate>
<ItemStyle Width="100px" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:ImageButton ID="imgSel" runat="server" ImageUrl="~/Images/edit-icon.png" AlternateText="Select" CommandName="Select" />
</ItemTemplate>
<ItemStyle Width="100px" />
</asp:TemplateField>
C#
protected void grdLogedUserDetails_RowCommand(object sender, GridViewCommandEventArgs e)
{
int rowIndex = Convert.ToInt32(e.CommandArgument);
//Reference the GridView Row.
GridViewRow row = grdLogedUserDetails.Rows[rowIndex];
//Access Cell values.
int RefID= int.Parse(row.Cells[0].Text);
string Company= row.Cells[1].Text;
string Division= row.Cells[2].Text;
}
protected void grdLogedUserDetails_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Access Cell values.
var RefId = int.Parse(e.Row.Cells[0].Text); // Error Input string is not in correct Formate
string Comany= e.Row.Cells[1].Text;
string Division= e.Row.Cells[2].Text;
}
}
While Debugging I can see Error Like :
"Input string is not in correct Format" Where i am doing wrong
My Table Structure
________________________________________
Ref_ID| CompanyName | DivisionName |
______|_______________|_________________|
6 | Company | Sales |
8 | Company | Sales |
14 | Company | Sales |
______|_______________|_________________|
RefID i have taken as "int" and CompanyName and DivisionName "string" so where i my input string is in wrong format,
Where i am doing wrong Please suggest me on same

The rowcommand event does not trigger rowindexed change unless you have Command="Select" but you DO HAVE Command="Select". However, you don't have a CommandArugment.
However, since you do have command=Select, then move your code to SelectedIndexChanged. The issue is you can't get/grab the row from the "row" command event since the row has not changed. The rowcommand event fires before SelectedIndexChanged. And as noted, unless you use a special command (delete or select) then SelectedIndexChanged does NOT fire.
So rowindex will NOT have been set in the row command event. However, this will mean that for your select button (and delete) your code will be (can be) in rowindexchanged "if" you use say select (or "delete") for the command. if you use a custom command name, then rowindexedchanged does NOT fire.
You can continue to use rowcommand, but you need the CommandArugment to pass either the PK of the row, or the index of the row.
So you have two choices here. (actually 3).
You can set the value of CommandArugment of that button.
Either to the PK, or you can use this
CommandArgument ='<%# Container.DataItemIndex%>'
I note that in your command settings, you are NOT setting the CommandArugment - you have to set it in your markup. The above expression will return the index into the grid.
You can move your code to rowindexchanged.
However, there is a 3rd choice. You CAN GET the rowindex in rowcommand. So from the depths of hell, you can use this stunning whopper insane of a statement:
If e.CommandName = "MySelect" Then
' now get row.
Dim gvRow As GridViewRow = CType(CType(e.CommandSource, Control).NamingContainer, GridViewRow)
Debug.Print("row index = " & gvRow.DataItemIndex)
Dim MyLabel As Label = gvRow.FindControl("HotelName")
Debug.Print("Value ref id = " & MyLabel.Text)
End If
Note VERY careful:
For the templated fields - we use find control. For non tempalted fields, then you can reference by cell.
Now that super award winning ugly way to get the row in row command?
In C# it will look like this:
{
GridViewRow gvRow = (GridViewRow)(Control)e.CommandSource.NamingContainer;
}
So, you have to use above, or as noted, move your code to SelectedIndexChanged.
Since you only have a select and delete button, then I would suggest SelectedIndexChanged. But if you were to say introduce another button - then you would not want to use Select or Delete, but a custom command name of your choosing (say CommandName="MyViewer"). In that case, then SelectedIndexChanged will not fire. But then you would have a means to determine which button was clicked upon (beyond the need of select and delete commands).
So in summary:
You have about 3+ ways to do this.
Keep in mind that in row command, the selected index event has NOT yet fired.
Keep in mind that if you use a custom row command name, then selected index WILL NOT fire.
Keep in mind that you can pick up the selected row with that award winning ugly line of code.
Keep in mind that you can't use cells() collection for your custom templated columns - so use find control.
Keep in mind that selectedindex in row command event has NOT changed nor fired yet.
Since you ARE using select, then you have a choice of row command event, or selectedindex changed event - they will both fire in your case.

The problem is that the cell does not contain any text, but a Label lblRef_ID. So you need to access the label, not the cell value.
var label = e.Row.FindControl("lblRef_ID") as Label;
var RefId = int.Parse(label.Text);

Generated ASP table add buttons that pull row values

ok so I have this ASP:Table which pulls its rows of info from a stored procedure query, only two columns but wish to add a third with a button for each row that when clicked will grab the information in the prior columns for use in another function.
not sure how the hell to code it though as the buttons are generated per row and how can I programme events for a unknown number of buttons there must be a way of doing It programmatically.
Table Header
Datacolumn1 Datacolumn2
a 2 Select
b 4 Select
e 9 Select
so when I press select on the second row it gives me string1=b string2=4
I imagine the code would look something like this (not likely but in a ideal world :D)
protected void select_row (eventargs as e)
{
string data1 = Row(e).cell(0).text
int data2 = Row(e).cell(1).text
}

For a grid like this
<asp:GridView ID="Grid1" runat="server" onrowcommand="Grid1_RowCommand" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="Datacolumn1" HeaderText="Data column1" />
<asp:BoundField DataField="Datacolumn2" HeaderText="Data column2" />
<asp:TemplateField>
<ItemTemplate>
<asp:Button runat="server" CommandName="SelectIt" Text="Select" CommandArgument='<%# Eval("Datacolumn1") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Use RowCommand event
protected void Grid1_RowCommand(object sender, GridViewCommandEventArgs e)
{
var btn = (Button)e.CommandSource ;
if (e.CommandName == "SelectIt")
{
var Row =(GridViewRow) btn.NamingContainer;
var Datacolumn1 = Row.Cells[0].Text;
var Datacolumn2 = Row.Cells[1].Text;
btn.Text = "selected: " + Datacolumn1 + "," + Datacolumn2;
}
}

How to get cell value in RowUpdating Event GridView?

I want to obtain the new value of a cell in the gridview rowUpdating event:
roles.RoleName = gvRoles.Rows[e.RowIndex].Cells[GetColumnIndexByName(row, "RoleName")].Text;
But the value is empty.
I have checked e.NewValues which is an ordered Dictionary. It contains the new changed value. How do I retrieve the new values for update?
aspx design is:
<asp:GridView ID="gvRoles" DataKeyNames="RoleId" runat="server"
AutoGenerateColumns="False" GridLines="Vertical" CssClass="table
table-striped table-bordered" AutoGenerateEditButton="True"
OnRowCancelingEdit="gvRoles_RowCancelingEdit" OnRowUpdating="gvRoles_RowUpdating"
OnRowEditing="gvRoles_RowEditing">
<Columns>
<asp:BoundField DataField="RoleId" HeaderText="RoleId" ReadOnly="True" />
<asp:BoundField DataField="RoleName" HeaderText="RoleName" ReadOnly="false" />
<asp:BoundField DataField="Role_Description" HeaderText="Role Description" ReadOnly="false" />
<asp:TemplateField HeaderText="RoleStatus">
<EditItemTemplate>
<asp:DropDownList ID="ddlStatus" runat="server" SelectedValue='<%# Bind("Role_Status") %>' >
<asp:ListItem>True</asp:ListItem>
<asp:ListItem>False</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblRoleStatus" runat="server"
Text='<%# Bind("Role_Status") %>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

The easiest way which i found out is to discovered e.NewValues. As I mentioned above it is an ordered dictionary and only i need to manage it.
I need to retrieve new values from this dictionary, which is done i this way.
if (!string.IsNullOrEmpty(e.NewValues["RoleName"].ToString()))
{
roles.RoleName = e.NewValues["RoleName"].ToString();
}
if you have template field it also work for it;
if (!string.IsNullOrEmpty(e.NewValues["Role_Status"].ToString()))
{
roles.Role_Status = Convert.ToBoolean(e.NewValues["Role_Status"].ToString());
}
This is the easiest thing I ever discovered. before that i want just using Find control and casting and then retrieving all lot code.
There is also e.OldValues ordered dictionary. Every one can use it to compare the new value with old ones. If values are same they could notify user to change the value(give new cell value).

GridViewRow row = (GridViewRow)gvRoles.Rows[e.RowIndex];
TextBox textRName = (TextBox)row.Cells[1].Controls[0];
string rname=textRname.Text;

Try This:
protected void gvRoles_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = gvRoles.Rows[e.RowIndex];
TextBox txtBox= (TextBox)(row.Cells[1].Controls[0]);
if(txtBox!=null)
{
String str = txtBox.Text;
}
}

After searching long and hard I found a great article that solved my issue. Take a look at the page load if you are binding on post back then the values get updated before you are able to access them.
Follow this link for more details --> https://taditdash.wordpress.com/2014/06/30/why-gridview-rowupdating-event-is-not-giving-the-updated-values/

The return data type ICollection is a bit tricky. Would have preferred a different data type than a string array but this was simplest direct conversion.
// grabs column headers
String[] keyStrings = new string[e.NewValues.Count];
System.Collections.ICollection keys = e.NewValues.Keys;
keys.CopyTo(keyStrings, 0);
// grabs edit row values
String[] valuesStrings = new string[e.NewValues.Count];
System.Collections.ICollection values = e.NewValues.Values;
values.CopyTo(valuesStrings, 0);
The end result here has two string arrays values and keys which can then be indexed, where the column header has the same index value as the cell value of the edited row.

Asp.Net C# GridView first cell in third column is empty but data exists

Hi and thanks in advance.
I have a gridview that has four columns. The fourth column is hidden or displayed based on a set of criteria which is working correctly. But when the table displays, the very first cell in that last column is not showing any text, even though on databound it clearly shows that it has the text. So the gridview winds up showing data like this:
Name Address Zip Code
X H. Smith 123 Raton Ave.
X A. Rally 345 6th St 98453
X B. Holcomb 876 Harrison Blvd 56321
The OnRowDataBound looks like this:
protected void gvAddresses_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//This test evaluation string showed the correct data for every row
//string myvalue = DataBinder.Eval(e.Row.DataItem, "ZipCode").ToString();
if (user.State == (int)States.California)
gvAddresses.Columns[3].Visible = true;
}
}
There doesn't seem to be any problem with the binding and when I debug through the gridview each row is processed as I would expect. Here is the gridview:
<asp:GridView runat="server" ID="gvAddresses" CssClass="TableFormat gvMargin" Width="100%" AutoGenerateColumns="false"
OnRowCommand="gvAddresses_OnRowCommand" OnRowDeleting="gvAddresses_OnRowDeleting" OnRowDataBound="gvAddresses_OnRowDataBound">
<EmptyDataTemplate>
<div style="text-align: center;">No addresses available.</div>
</EmptyDataTemplate>
<Columns>
<asp:TemplateField HeaderText="" ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:LinkButton ID="lnkRemoveAddress" runat="server" OnClientClick="if(!confirm('Are you sure you want to delete this record?')) return ;" style="color: maroon; font-weight: bold;" Text="X" CommandName="Delete" CommandArgument='<%# Eval("AddressCode") %>'></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Name" HeaderText="Name" />
<asp:BoundField DataField="Address" HeaderText="Address" />
<asp:BoundField DataField="ZipCode" HeaderText="Zip Code" Visible="False"/>
</Columns>
</asp:GridView>
How else can I discover what is happening to this first cell?

First problem is this: you are checking every individual row and setting the entire column to visible or not over and again. You should check for State before you databind, since it is the user object I would suggest doing it on preinit.
I suggest you remove the visible=false from your markup. When you set visible to false then the control/object isn't rendered into the HTML. Your problem will most likely be fixed if you remove the visibility attribute from the markup and assign that value at the proper time in codebehind.
protected override void OnPreInit(EventArgs e)
{
base.OnPreInit(e);
if (!postback)
{
gvAddresses.Columns[3].Visible = User.State == (int)States.California;
}
}

ASP.NET C# Connect Checkboxex with Datatable

I'm just at a function, which outputs a list of file names from the database. I get this also from the database and store it into a DataTable. The DataTable give the list to a DataGrid, which displays it on the page. That works fine.
My problem is that I want next to each file name have a check box on the right, which I can tick and Next time when I save the form, the database entry will be deleted.
How can I do this so the program dynamically displays the checkbox to the DataTable and the checkbox would know to which entry it has?
Best Regards
Michael Ryter

<asp:TemplateField HeaderText="name" SortExpression="Name">
<ItemTemplate>
<asp:Checkbox id="chkIsDeletable" runat="server" />
<asp:HiddenField id="hndFileId" runat="server" Value='<%#Eval("FileID")%>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="name" SortExpression="Name">
<ItemTemplate>
<%#Eval("filename") %>
</ItemTemplate>
</asp:TemplateField>
Now on button click event:
protected void Button_Click(object sender, EventArgs e)
{
String SelectedFileIds ="";
foreach (GridViewRow item in GridView1.Rows)
{
CheckBox chkIsDeletable = item.FindControl("chkIsDeletable") as CheckBox;
HiddenField hndFileId = item.FindControl("hndFileId") as HiddenField;
if (chkIsDeletable.Checked)
SelectedFileIds = hndFileId.Value + ",";
}
SelectedFileIds = SelectedFileIds.TrimEnd(",");
}
Now you will have all those file ids for which you have ticked the checbox, now you can delete those records from the database which contains selected fileids.
Hope, it will help you!!!