In this article I will explain how to enable disable CheckBox in GridView based on some condition in ASP.Net using C# and VB.Net.
The CheckBox can be dynamically enabled and disabled in GridView in the following two ways
1. Using Eval function.
2. Using OnRowDataBound event.
Namespaces
You will need to import the following namespace.
C#
VB.Net
Binding the GridView
The GridView is populated using some dummy records using DataTable.
C#
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Status") });
dt.Rows.Add(1, "John Hammond", "Absent");
dt.Rows.Add(2, "Mudassar Khan", "Present");
dt.Rows.Add(3, "Suzanne Mathews", "Absent");
dt.Rows.Add(4, "Robert Schidner", "Present");
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
VB.Net
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not Me.IsPostBack Then
Dim dt As New DataTable()
dt.Columns.AddRange(New DataColumn(2) {New DataColumn("Id"), New DataColumn("Name"), New DataColumn("Status")})
dt.Rows.Add(1, "John Hammond", "Absent")
dt.Rows.Add(2, "Mudassar Khan", "Present")
dt.Rows.Add(3, "Suzanne Mathews", "Absent")
dt.Rows.Add(4, "Robert Schidner", "Present")
GridView1.DataSource = dt
GridView1.DataBind()
End If
End Sub
1. Using Eval function
In this technique one has to write the condition within the <% %> tags. Below you will notice that I am matching the value of the Status field with the string Present and thus for all the records for which the Status is Present, the CheckBox will be enabled and for the remaining it will be disabled.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" Enabled='<%# Eval("Status").ToString().Equals("Present") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
<asp:BoundField DataField="Status" HeaderText="Status" ItemStyle-Width="100" />
</Columns>
</asp:GridView>
2. Using OnRowDataBound event
Another way is to make use of OnRowDataBound event of GridView. Thus first you need to assign OnRowDataBound event handler to the GridView as show below.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="OnRowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
<asp:BoundField DataField="Status" HeaderText="Status" ItemStyle-Width="100" />
</Columns>
</asp:GridView>
Then you need to implement the OnRowDataBound event handler in the code behind and then enable and disable the CheckBox conditionally by matching the value with the Status field.
Here the value of the Status field is matched with the string Absent and if it matches then the CheckBox is disabled.
C#
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
CheckBox CheckBox1 = (e.Row.FindControl("CheckBox1") as CheckBox);
if (e.Row.Cells[2].Text == "Absent")
{
CheckBox1.Enabled = false;
}
}
}
VB.Net
Protected Sub OnRowDataBound(sender As Object, e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim CheckBox1 As CheckBox = TryCast(e.Row.FindControl("CheckBox1"), CheckBox)
If e.Row.Cells(2).Text = "Absent" Then
CheckBox1.Enabled = False
End If
End If
End Sub
![2014-09-13_1323.png]()
Demo
Downloads
