Retrieve Rows Selected Using CheckBox in an ASP.NET GridView

I bet you must have seen this question asked a several times ‘How Can I find out which Checkboxes were selected in a GridView. I also want to retrieve row data for these selected rows on Postback’.

I personally have seen this question hundreds of times on the forums, newsgroups. If you have been facing this requirement, here’s a full working example for you to try out. This example binds the GridView to a List<>

Points to observe:

- The AutoGenerateColumns of the GridView is set to false

- The CheckBox has been added inside an ItemTemplate

- DataKeyName of the GridView is set to ID.

C#

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default4 : System.Web.UI.Page
{
List listEmp = new List();

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Employee emp = new Employee();
listEmp = emp.GetEmployees();
this.GridView1.DataSource = listEmp;
this.GridView1.DataBind();
}
}

protected void btnRetrieveCheck_Click(object sender, EventArgs e)
{
foreach (GridViewRow row in GridView1.Rows)
{
CheckBox cb = (CheckBox)row.FindControl("chkSel");
if (cb != null && cb.Checked)
{
Response.Write("Employee Id: " +
GridView1.DataKeys[row.RowIndex].Value
+ " Name: " + row.Cells[2].Text + "
");
}
}
}
}

public class Employee
{

public int ID { get; set; }

public string FName { get; set; }

public int Age { get; set; }

public char Sex { get; set; }

public List GetEmployees()
{
List eList = new List();

eList.Add(new Employee() { ID = 1, FName = "John", Age = 23, Sex = 'M' });

eList.Add(new Employee() { ID = 2, FName = "Mary", Age = 25, Sex = 'F' });

eList.Add(new Employee() { ID = 3, FName = "Amber", Age = 23, Sex = 'M' });

eList.Add(new Employee() { ID = 4, FName = "Kathy", Age = 25, Sex = 'M' });

eList.Add(new Employee() { ID = 5, FName = "Lena", Age = 27, Sex = 'F' });

eList.Add(new Employee() { ID = 6, FName = "John", Age = 28, Sex = 'M' });

eList.Add(new Employee() { ID = 7, FName = "Kathy", Age = 27, Sex = 'F' });

eList.Add(new Employee() { ID = 8, FName = "John", Age = 28, Sex = 'M' });

return eList;
}


}

VB.NET

Imports System
Imports System.Collections.Generic
Imports System.Web.UI
Imports System.Web.UI.WebControls

Partial Public Class Default4
Inherits System.Web.UI.Page
Private listEmp As New List(Of Employee)()

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If (Not Page.IsPostBack) Then
Dim emp As New Employee()
listEmp = emp.GetEmployees()
Me.GridView1.DataSource = listEmp
Me.GridView1.DataBind()
End If
End Sub

Protected Sub btnRetrieveCheck_Click(ByVal sender As Object, _
ByVal e As EventArgs)
For Each row As GridViewRow In GridView1.Rows
Dim cb As CheckBox = CType(row.FindControl("chkSel"), CheckBox)
If cb IsNot Nothing AndAlso cb.Checked Then
Response.Write("Employee Id: " & _
GridView1.DataKeys(row.RowIndex).Value & " Name: " & _
row.Cells(2).Text & "
")
End If
Next row
End Sub
End Class

Public Class Employee

Private privateID As Integer
Public Property ID() As Integer
Get
Return privateID
End Get
Set(ByVal value As Integer)
privateID = value
End Set
End Property

Private privateFName As String
Public Property FName() As String
Get
Return privateFName
End Get
Set(ByVal value As String)
privateFName = value
End Set
End Property

Private privateAge As Integer
Public Property Age() As Integer
Get
Return privateAge
End Get
Set(ByVal value As Integer)
privateAge = value
End Set
End Property

Private privateSex As Char
Public Property Sex() As Char
Get
Return privateSex
End Get
Set(ByVal value As Char)
privateSex = value
End Set
End Property

Public Function GetEmployees() As List(Of Employee)
Dim eList As New List(Of Employee)()

eList.Add(New Employee() With {.ID = 1,.FName = "J",.Age = 23,.Sex = "M"c})

eList.Add(New Employee() With {.ID = 2,.FName = "M",.Age = 25,.Sex = "F"c})

eList.Add(New Employee() With {.ID = 3,.FName = "A",.Age = 23,.Sex = "M"c})

eList.Add(New Employee() With {.ID = 4,.FName = "K",.Age = 25,.Sex = "M"c})

eList.Add(New Employee() With {.ID = 5,.FName = "L",.Age = 27,.Sex = "F"c})

eList.Add(New Employee() With {.ID = 6,.FName = "J",.Age = 28,.Sex = "M"c})

eList.Add(New Employee() With {.ID = 7,.FName = "K",.Age = 27,.Sex = "F"c})

eList.Add(New Employee() With {.ID = 8,.FName = "J",.Age = 28,.Sex = "M"c})

Return eList
End Function