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Maintain sorting throughout paging in gridview in asp.net

How to maintain sorting throughout paging in gridview in asp.net.
Below is my code behind for binding grid, paging, and sorting
private string SortDirection
{
get { return ViewState["SortDirection"] != null ? ViewState["SortDirection"].ToString() : "ASC"; }
set { ViewState["SortDirection"] = value; }
}
private void BindGV(string sortExpression = null)
{
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
SqlConnection con = new SqlConnection(CS);
SqlCommand cmd = new SqlCommand("SPGetEmpDetailes", con);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter sda = new SqlDataAdapter(cmd);
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
if (sortExpression != null)
{
DataView dv = dt.AsDataView();
this.SortDirection = this.SortDirection == "ASC" ? "DESC" : "ASC";
dv.Sort = sortExpression + " " + this.SortDirection;
EmployeeGV.DataSource = dv;
}
else
{
EmployeeGV.DataSource = dt;
}
EmployeeGV.DataBind();
}
}
I am new to .NET and I want to maintain sorting throughout paging but I don't know how to do it.
protected void EmployeeGV_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
EmployeeGV.PageIndex = e.NewPageIndex;
BindGV();
}
protected void EmployeeGV_Sorting(object sender, GridViewSortEventArgs e)
{
this.BindGV(e.SortExpression);
}

Ok, so since we have a data pager here, then that means the data page routine will re-bind the GV. So, that means:
Loading up - first page load - we fill the grid
When we page - we fill the grid
When we sort - we fill the grid.
So, from above, we see at least 3 places. That suggests we need (and want) ONE routine to load up the grid - since we have several places where we will do this.
And I see you have one routine for this. We tweak it up a bit.
Next up:
The sort value we get/have does not persit, so once again we can use ViewState for that. (and again I see you attempting to use that).
So, lets lay this out.
First up, and NEVER forget this rule:
You want to load combo boxes, grids, listbox and ANY data on your FIRST page load, and ONLY your first page load, and ONLY first time. If you break this rule then you in effect cannot build a working web forms page - you just can't!!!!
And the reason is simple:
Any button click, any post-back, and any code operations on that page will ALWAYS and I repeat ALWAYS will trigger the page load event first and then YOUR event - (button click, paging or whatever). So, that means we ALWAYS will have our page load code stub and have a if (!IsPostBack) code stub - (darn near always follow this design pattern).
Ok, so lets code this up.
next up: I see no reason to put say a datatable in some using block - they safe dispose on their own. However, adopting using blocks for sql connections, and things like a sql command object - yes, do apply a using block.
Ok, I think we quite much cleared up the base issues.
So, lets setup the code, say like this:
So, say our simple markup - we dropped in a row select button.
<div style="padding:35px;width:55%">
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False" DataKeyNames="ID" CssClass="table"
AllowPaging="True" OnPageIndexChanging="GridView1_PageIndexChanging" PageSize="8" AllowSorting="True" OnSorting="GridView1_Sorting">
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="First" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="Last" SortExpression="LastName" />
<asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
<asp:BoundField DataField="Description" HeaderText="Description" SortExpression="Description" />
<asp:CheckBoxField DataField="Active" HeaderText="Active" ItemStyle-HorizontalAlign="Center" />
<asp:TemplateField>
<ItemTemplate>
<asp:Button runat="server" Text="View" CssClass="btn" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<PagerStyle CssClass="GridPager" />
</asp:GridView>
</div>
Ok, now our code, say this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["MySort"] = "HotelName";
BindGV();
}
}
void BindGV()
{
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
using (SqlCommand cmdSQL = new SqlCommand("SELECT * FROM MyHotels", conn))
{
conn.Open();
DataTable rstData = new DataTable();
rstData.Load(cmdSQL.ExecuteReader());
// apply optional sort
if (ViewState["MySort"] != null)
rstData.DefaultView.Sort = ViewState["MySort"] as string;
GridView1.DataSource = rstData;
GridView1.DataBind();
}
}
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
BindGV();
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
ViewState["MySort"] = e.SortExpression;
BindGV();
}
And now we get this:
So, the trick or approach?
We have ONE view sate that holds our sort - when we want to sort, we simply put into this ViewState["MySort"] = some column to sort. After that, our bind + load routines are free to run - and we sort if set.
Thus, the pager routine, sort routine, and load routine -- they all call that one routine, and thus we don't have to write a lot of code.
And the view button? Well, if we click on that button (say we add a click event) like this:
Then the row button click can be this:
protected void Unnamed_Click(object sender, EventArgs e)
{
Button btn = sender as Button;
GridViewRow gRow = btn.NamingContainer as GridViewRow;
Debug.Print("Row index click = " + gRow.RowIndex.ToString());
// get database (hidden pk row id
int? PKID = GridView1.DataKeys[gRow.RowIndex]["ID"] as int?;
Debug.Print("Database PK = " + PKID.ToString());
Debug.Print("Hotel name this row = " + gRow.Cells[2].Text);
}
And clicking, we get:

Replace DataReader data

I'm working on a ASP.Net Web Forms Application.Currently SqlDataReaders directly bind to the two grid views. I need to change the data set before binding it to the grid view .There are two datasets coming from Stored Procedure (Two select Queries). I need to edit both of them and replace some data before binding to grids .What is the best way to achieve this.?
private void BindTable()
{
LiteralMessage.Text = "";
RecentLiteralMessage.Text = "";
ErrorLiteralMessege.Text = "";
var isStandbySelected = SelectedDatabase.SelectedValue == "stats";
using (var db = new Database(isStandbySelected))
{
try
{
//db.BeginTransaction(IsolationLevel.Snapshot);
db.BeginTransaction(); //Need a transaction block to stop from closing connection
db.StoredProcedure = "dbo.NewExportList";
if (!string.IsNullOrEmpty(TextBoxNameFilter.Text))
db.AddParameter("#nameFilter", TextBoxNameFilter.Text);
db.AddParameter("#excludedExports", CheckBoxExcludedExports.Checked);
db.AddParameter("#RunOnReportingServer", SelectedDatabase.SelectedValue == "stats" );
if(CheckBoxRecentlyRun.Checked)
db.AddParameter("#recentExports", true);
System.Data.SqlClient.SqlDataReader reader = db.GetDataReader();
GridViewExports.DataSource = reader;
GridViewExports.DataBind();
if (GridViewExports.Rows.Count > 0)
{
GridViewExports.Visible = true;
}
else
{
GridViewExports.Visible = false;
LiteralMessage.Text = "No Results";
}
GridViewRecentExports.DataSource = null; //clear any exsisting data
if (reader.NextResult()) //Get the second data set if any
{
GridViewRecentExports.DataSource = reader;
}
GridViewRecentExports.DataBind();
if (GridViewRecentExports.Rows.Count > 0)
{
GridViewRecentExports.Visible = true;
}
else
{
GridViewRecentExports.Visible = false;
RecentLiteralMessage.Text = "No Results";
}
db.CloseConnection();
//db.CommitTransaction();
}
catch (Exception ex)
{
}
}

Ok, there are two approaches common used here.
First, lets take a sample GV, and work though the two common apporaches here.
Our simple markup:
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False" DataKeyNames="ID" CssClass="table">
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" />
<asp:BoundField DataField="HotelName" HeaderText="HotelName" />
<asp:BoundField DataField="Description" HeaderText="Description" />
<asp:BoundField DataField="Nights" HeaderText="Nights" ItemStyle-HorizontalAlign="Center" />
<asp:BoundField DataField="Price" HeaderText="Price" DataFormatString="{0:c2}"
ItemStyle-HorizontalAlign="Right" />
</Columns>
</asp:GridView>
Ok, and our code to load:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
LoadGrid();
}
void LoadGrid()
{
DataTable rstData = new DataTable();
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
string strSQL = "SELECT * FROM tblHotels ORDER BY HotelName";
using (SqlCommand cmdSQL = new SqlCommand(strSQL, conn)) {
conn.Open();
rstData.Load(cmdSQL.ExecuteReader());
}
}
GridView1.DataSource = rstData;
GridView1.DataBind();
}
Ok, and we now have this:
so, with above, we say want the the total price for each row booking to show.
So, lets use the "common" approach here. We first add our extra control to the grid view. Lets use a plane jane text box:
eg: this:
<asp:BoundField DataField="Price" HeaderText="Price" DataFormatString="{0:c2}"
ItemStyle-HorizontalAlign="Right" />
<asp:TemplateField HeaderText="Total">
<ItemTemplate>
<asp:Label ID="lblTotal" runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
so, we just added a label to the gv.
So, the event we use is the row data bound event This even is great, since it gives us the one data row, and the one grid view row to work with. This event also great for changing the color of a row, or text box, and of course also doing some calculation or setting up the value of a un-bound control - such as our label called
So, now in our row data bound event, we can do this:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRowView gData = (DataRowView)e.Row.DataItem;
Label lblTotal = e.Row.FindControl("lblTotal") as Label;
decimal MyPrice = (int)gData["Nights"] * (decimal)gData["Price"];
lblTotal.Text = string.Format("{0:c2}", MyPrice);
}
}
And now our gird is this:
Ok, so above is the common approach.
However, a interesting approach?
Once you fill a data table, then you are free to process that table, and that EVEN includes adding new columns to the table!!!
So, lets dump (remove) our data bound row event.
lets CHANGE the label to use bound data from the table. So, our markup is now:
<asp:TemplateField HeaderText="Total">
<ItemTemplate>
<asp:Label ID="lblTotal" runat="server"
Text = '<%# string.Format("{0:c2}", Eval("MyTotal")) %>'
></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Now, we don't' have a column in data table called MyTotal, do we?
but, we can AFTER getting the table from the query or stored procedure ADD the table.
so, our grid load code now becomes this:
DataTable rstData = new DataTable();
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
string strSQL = "SELECT * FROM tblHotels ORDER BY HotelName";
using (SqlCommand cmdSQL = new SqlCommand(strSQL, conn)) {
conn.Open();
rstData.Load(cmdSQL.ExecuteReader());
}
}
rstData.Columns.Add("MyTotal", typeof(decimal));
foreach (DataRow MyRow in rstData.Rows)
{
MyRow["MyTotal"] = (int)MyRow["Nights"] * (decimal)MyRow["Price"];
}
GridView1.DataSource = rstData;
GridView1.DataBind();
}
Note how we just added a new column, and then did a table process loop to setup that value. The results of the GV are thus the same.
Last but not least?
FEW PEOPLE realize that a data table supports expressions!!!
And when you modify values etc. the update automatic. So, in place of that row processing loop above? We could in fact do this:
DataColumn MyCol = new DataColumn("MyTotal", typeof(decimal));
MyCol.Expression = "[Nights] * [Price]";
rstData.Columns.Add(MyCol);
GridView1.DataSource = rstData;
GridView1.DataBind();
So, in most cases, I often just use the row data bound. And this event is nice since you don't write a loop, and for conditional format such as a row color change, or a column/cell format of color etc., or the new setting of the new text box? row data bound is nice.
But, you can also as noted, add columns, and loop + process the data table, and you can even add columns that are based on expressions of other columns. You then send that updated and pre-processed table to the gridview as normal.
Also note that while I used a query, a store procedure would work the same way:
eg:
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
using (SqlCommand cmdSQL = new SqlCommand("MyStoreProcedure", conn)) {
cmdSQL.CommandType = CommandType.StoredProcedure;
cmdSQL.Parameters.Add("#Active", SqlDbType.Bit).Value = 1;
conn.Open();
rstData.Load(cmdSQL.ExecuteReader());
}
}
DataColumn MyCol = new DataColumn("MyTotal", typeof(decimal));
MyCol.Expression = "[Nights] * [Price]";
rstData.Columns.Add(MyCol);
GridView1.DataSource = rstData;
GridView1.DataBind();

Populate correlated data to selected row based on id C#

I'm trying to populate matching patientID data from Patients table with Demographics table. I'm using two different forms. My latest try is to join both tables and call .Where() to match the ID.
This works but it calls all matched data. The goal is to call Only the selected row from the Patients form. Initially I tried to select the PatientID then match it with C_PatientID but no luck.
var patientID = _db.Patients.Where(i => i.PatientID > 0).Select(i => new
{
PatientNumber = i.PatientID,
});
My latest attempt is to use the selected row index but have not figured out how to properly implement it to call the patients data.
var patientID = gvDemographics.SelectedCells.Cast<DataGridViewCell>()
.Select(cell => cell.RowIndex)
.Distinct();
The initial form to be loaded is the patients the it should call the demographics once the row is selected. Please advice.
Using Microsoft SQL Server Management Studio for data. First form to populate patients
private void PopulateGrid()
{
var records = _db.Patients.Select(q => new
{
PatientNumber = q.PatientID,
PatientFirstName = q.PatientFirstName,
PatientLastName = q.PatientLastName,
DateOfBirth = q.DateOfBirth,
Gender = q.Gender,
Address = q.Address,
State = q.State,
City = q.City,
ZipCode = q.ZipCode,
ContactNumber = q.ContactNumber,
Email = q.Email,
}).ToList();
gvPatients.DataSource = records;
gvPatients.Columns["PatientNumber"].HeaderText = "Patient#";
gvPatients.Columns["PatientFirstName"].HeaderText = "First Name";
gvPatients.Columns["PatientLastName"].HeaderText = "Last Name";
gvPatients.Columns["DateOfBirth"].HeaderText = "DOB";
gvPatients.Columns["ZipCode"].HeaderText = "Zip Code";
gvPatients.Columns["ContactNumber"].HeaderText = "Contact Number";
//Hide the column for ID. Changed from the hard coded column value to the name,
// to make it more dynamic.
gvPatients.Columns["PatientNumber"].Visible = true;
}
button to call second form
private void btnViewMedicalHistory_Click(object sender, EventArgs e)
{
var viewMedicalHistory = new Demographics();
viewMedicalHistory.MdiParent = this.MdiParent;
viewMedicalHistory.Show();
}

It would help if you noted what control or how you displaying the data on the first page.
I mean, say I have a list of hotels - like this:
<asp:GridView ID="GridView1" runat="server" CssClass="table" Width="45%"
AutoGenerateColumns="False" DataKeyNames="ID" >
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" />
<asp:BoundField DataField="HotelName" HeaderText="HotelName" />
<asp:BoundField DataField="City" HeaderText="City" />
<asp:BoundField DataField="Description" HeaderText="Description" />
<asp:TemplateField HeaderText="View">
<ItemTemplate>
<asp:Button ID="cmdView" runat="server" Text="View" cssclass="btn"
OnClick="cmdView_Click"
/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And we fill the grid like this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
LoadGrid();
}
void LoadGrid()
{
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
using (SqlCommand cmdSQL = new SqlCommand("SELECT * from tblHotels ORDER BY HotelName", conn))
{
conn.Open();
DataTable rst = new DataTable();
rst.Load(cmdSQL.ExecuteReader());
GridView1.DataSource = rst;
GridView1.DataBind();
}
}
}
So our output is now like this:
And the button click to get the primary key of the database row is this:
protected void cmdView_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
GridViewRow gRow = (GridViewRow)btn.Parent.Parent;
int PKID = (int)GridView1.DataKeys[gRow.RowIndex]["ID"];
Session["PKID"] = PKID;
Response.Redirect("ShowOneHotel.aspx");
}
}
NOTE very close how I did not expose, or even show/display the database primary key in the above GV, but I am able to have row click, get row index, and from that I get the PK value (that is what DataKeyNames="ID" is for.
Now, it is a simple matter to pass the PK id from the current page to the next page - I used session. So now, in the next page you jump to, you can retrieve and display the information.
Note how I did not really even bother with the "selected" row setup of the GV - just drop in a plane jane button, write up a plane jane button click, and get the PK and row index as I did.

Updating a Data Bound GridView on Button Click

So I have a .aspx page that is bound to some data. I can run a LINQ query and return it as an IQueryable object in the SelectMethod for the GridView control, and it will populate fine. What I am trying to do is populate the GridView based upon a selection from a ListBox control. Since the data is bound, I can't set the DataSource equal to the query. I could maybe figure out a way to re-use the SelectMethod based on a public string (which would in turn be based off the ListBox selection), but that would be pretty ugly.
Here is the gridview control on my .aspx page:
<asp:GridView runat="server" ID="employeesGrid"
ItemType="Foo.Models.Employee" DataKeyNames="EmployeeID"
SelectMethod="employeeGrid_GetData"
AutoGenerateColumns="false">
<Columns>
<asp:DynamicField DataField="EmployeeID" />
<asp:DynamicField DataField="FirstName" />
<asp:DynamicField DataField="LastName" />
<asp:DynamicField DataField="CompanyName" />
</Columns>
</asp:GridView>
And here is my SelectMethod in the .cs:
public IQueryable<Employee> employeeGrid_GetData()
{
FooContext db = new FooContext();
var query = db.Employees.Where(e => e.CompanyName == "NameOfCompany");
return query;
}
That populates the GridView just fine on load, but it doesn't do much for me with updating on click.
And here is the button click method that I've tried but doesn't work. I get an error about not being able to use DataSource or DataSourceId when the GridView is bound to a data model:
public void btn_RequestEmployees_Click(object sender, EventArgs e)
{
string currentlySelectedEmployer = lstbxEmployers.SelectedValue.ToString();
FooContext db = new FooContext();
var query = db.Employees.Where(employee => employee.CompanyName == currentlySelectedEmployer);
employeesGrid.DataSource = query;
DataBind();
}
Any advice? Thanks.

Try it like this:
public IQueryable<Employee> employeeGrid_GetData()
{
string currentlySelectedEmployer = lstbxEmployers.SelectedValue.ToString();
FooContext db = new FooContext();
var query = db.Employees.Where(employee => employee.CompanyName == currentlySelectedEmployer);
return query;
}

how to get selected value of gridview in textbox using MVC(aspx) .net

net.
i want to get selected value from gridview into textbox,i have used sqlserever database to display data into gridview.
no other links helpful at ol to me.plz help me.
my aspx gridview of BranchManage.aspx page is:
<asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333"
GridLines="None" AutoGenerateColumns="False" DataSourceID="LinqDataSource_Branch">
<Columns>
<asp:CommandField ShowSelectButton="True" />
<asp:BoundField DataField="BranchName" HeaderText="BranchName" ReadOnly="True"
SortExpression="BranchName" />
<asp:BoundField DataField="CreateDate" HeaderText="CreateDate" ReadOnly="True"
SortExpression="CreateDate" />
</Columns>
</asp:GridView>
<asp:LinqDataSource ID="LinqDataSource_Branch" runat="server"
ContextTypeName="jemex.db.JemexDataContext" EntityTypeName=""
Select="new (BranchName, CreateDate)" TableName="Branches">
</asp:LinqDataSource>
-----And this is my part of code of LoginController.cs:
public ActionResult BranchManage(string submitButton, string branchname)
{
ViewBag.UserName = Session["username"];
if (Session["type"].ToString() == "Admin")
{
switch (submitButton)
{
case "Create Account":
return (Create_BranchAccount(branchname));
case "Update Account":
return (Update_BranchAccount());
case "Clear":
return (ClearBranch());
default:
return View();
}
}
else
{
return View("Login");
}
}
public ActionResult Create_BranchAccount(string branchname)
{
//DB.Execute_Qury("INSERT INTO Branches(BranchName,CreateDate,IsDeleted) VALUES (" +
branchname + "," + System.DateTime.Now + ",False)");
db1.R_Insert_Branch(branchname, System.DateTime.Now);
return View("BranchManage");
}
public ActionResult Update_BranchAccount()
{
SqlConnection con = new SqlConnection("Data Source=aaa-pc;Initial Catalog=logicnetclub_jemex;Integrated Security=True");
string strSQL = "Select * from Branches";
SqlDataAdapter dt = new SqlDataAdapter(strSQL, con);
DataSet ds = new DataSet();
dt.Fill(ds, "UserDetail");
con.Close();
GridView1.DataSource = ds;
GridView1.DataBind();
return View(ViewModel);
}
Here at update_BranchAccount ,how can i fetch gridview datasource?

You can put the selected value or cell from Grid View into a session and then re-use it somewhere else in the current page or any other required page. So when the page is requested again the value is shown automatically into the text-box.
::: Try this Sample Code.. Hope that could solve your problem :::
foreach (GridViewRow row in ViewData.Rows)
{
RadioButton rb = (RadioButton)row.FindControl("RowSelector");
if (rb.Checked)
{
string address = Convert.ToString(ViewData.Rows[row.RowIndex].Cells[column-index].Text);
Session["addressValue"] = address;
Response.Redirect("AnotherPage.aspx");
}
}
Then at update_BranchAccount, you can access the textbox value using-
textbox1.text = Session["addressValue"];

To get the value of one selected cell, you can use the CellClick event of gridview:
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
textBox1.Text = GridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
}

You didn't really use Model in MVC. Mixed up state-full webform code and Controller will confuse you.
The controller don't know any thing about View(aspx) So You need to parse FormCollection as Model into Action.
public ActionResult BranchManage(string branchname, FormCollection formData){
//.. now debug or test what formData really look like
You could change FormCollection to any user-defined type ( the Model)
learn how to parse the Model between controller and view Getting Started with ASP.NET MVC.