CheckBox:Select All CheckBoxes On Click Event in Asp.net C# Using Datalist.

Here I have explained how to check all checkboxex by click ckeckbox event.

HTML Markup

Step 1: Select CheckBox

<asp:Label ID="Label1" runat="server" Text="Label">Select All</asp:Label>
<asp:CheckBox ID="chkHeader" runat="server" AutoPostBack="true" OnCheckedChanged="CheckAll" />

Step 2: Select DataList and use another CheckBox control for checking all checkboxes.

<asp:DataList ID="dlforms" runat="server" RepeatColumns="6" Width="1800px">
<ItemTemplate>
<table>
<tr>
<td>
<asp:Label ID="lblformid" Visible="false" runat="server" Text='<%#Eval("Form_id")%>'></asp:Label>////Bind From Database
<asp:CheckBox ID="chkRow" runat="server" Font-Bold="true" Text='<%#Eval("Form_name")%>' ////Bind From Database OnCheckedChanged="check" /> </td>
</tr>
</table>
</ItemTemplate>
</asp:DataList>

C#

Step 3: Fill DataList from DataBase.

Step 4: OnCheckedChanged="CheckAll" Event Code.

Step 5: OnCheckedChanged="check" Event Code.