Check Uncheck CheckBoxes in ASP.Net GridView using C# and VB.Net

Hi mukesh1,

Check this example. Now please take its reference and correct your code.

HTML

<asp:GridView ID="grduser" runat="server" Width="100%" AutoGenerateColumns="false"
    BorderColor="#F7F7F7" BorderWidth="1" GridLines="Horizontal">
    <Columns>
        <asp:TemplateField>
            <HeaderTemplate>
                <div class="row">
                    <div class="col-md-5">
                        <asp:CheckBox ID="CheckBoxAll" AutoPostBack="true" runat="server" OnCheckedChanged="CheckBoxAll_CheckedChanged" />Select</div>
                    <div class="col-md-7">
                        User Name</div>
                </div>
            </HeaderTemplate>
            <ItemTemplate>
                <div class="row">
                    <div class="col-md-5">
                        <asp:CheckBox ID="CheckBox1" runat="server" Text="" />
                    </div>
                    <div class="col-md-7">
                        <asp:Label ID="lblname" runat="server" Text='<%# Eval("user_name") %>' Font-Size="Medium"></asp:Label>
                        <asp:Label ID="lbluser_id" runat="server" Visible="false" Text='<%# Eval("user_id") %>'
                            Font-Size="Medium"></asp:Label>
                    </div>
                </div>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;

VB

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[2] { new DataColumn("user_name", typeof(string)),
                    new DataColumn("user_id",typeof(int)) });
        dt.Rows.Add("John Hammond", 1);
        dt.Rows.Add("Mudassar Khan", 2);
        dt.Rows.Add("Suzanne Mathews", 3);
        dt.Rows.Add("Robert Schidner", 4);
        grduser.DataSource = dt;
        grduser.DataBind();
    }

}
protected void CheckBoxAll_CheckedChanged(object sender, EventArgs e)
{
    CheckBox ChkBoxHeader = (CheckBox)grduser.HeaderRow.FindControl("CheckBoxAll");
    foreach (GridViewRow row in grduser.Rows)
    {
        CheckBox ChkBoxRows = (CheckBox)row.FindControl("CheckBox1");
        if (ChkBoxHeader.Checked == true)
        {
            ChkBoxRows.Checked = true;
        }
        else
        {
            ChkBoxRows.Checked = false;
        }
    }

}
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    int count = 0;
    CheckBox ChkBoxHeader = (CheckBox)grduser.HeaderRow.FindControl("CheckBoxAll");
    foreach (GridViewRow row in grduser.Rows)
    {
        CheckBox ChkBoxRows = (CheckBox)row.FindControl("CheckBox1");
        if (ChkBoxRows.Checked)
        {
            count++;
        }
    }
    if (grduser.Rows.Count == count)
    {
        ChkBoxHeader.Checked = true;
    }
    else
    {
        ChkBoxHeader.Checked = false;
    }
}

VB

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn(1) {New DataColumn("user_name", GetType(String)), New DataColumn("user_id", GetType(Integer))})
        dt.Rows.Add("John Hammond", 1)
        dt.Rows.Add("Mudassar Khan", 2)
        dt.Rows.Add("Suzanne Mathews", 3)
        dt.Rows.Add("Robert Schidner", 4)
        grduser.DataSource = dt
        grduser.DataBind()
    End If
End Sub

Protected Sub CheckBoxAll_CheckedChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim ChkBoxHeader As CheckBox = CType(grduser.HeaderRow.FindControl("CheckBoxAll"), CheckBox)
    For Each row As GridViewRow In grduser.Rows
        Dim ChkBoxRows As CheckBox = CType(row.FindControl("CheckBox1"), CheckBox)
        If ChkBoxHeader.Checked = True Then
            ChkBoxRows.Checked = True
        Else
            ChkBoxRows.Checked = False
        End If
    Next
End Sub

Protected Sub CheckBox1_CheckedChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim count As Integer = 0
    Dim ChkBoxHeader As CheckBox = CType(grduser.HeaderRow.FindControl("CheckBoxAll"), CheckBox)
    For Each row As GridViewRow In grduser.Rows
        Dim ChkBoxRows As CheckBox = CType(row.FindControl("CheckBox1"), CheckBox)
        If ChkBoxRows.Checked Then
            count += 1
        End If
    Next

    If grduser.Rows.Count = count Then
        ChkBoxHeader.Checked = True
    Else
        ChkBoxHeader.Checked = False
    End If
End Sub

Screenshot