Checkbox Control in ASP.Net

The Checkbox control is used to display a check box. The Checkbox Web server control gives us an option to select. A checkbox is clicked to select and clicked again to deselect option. When a checkbox is selected, a check (a tick mark) appears indicating a selection.

Checkbox Control in ASP.Net


The main event of the Checkbox is the Checked Changed event

Code:

<asp:Label ID="Label2" runat="server" Text="Which programming language you know"></asp:Label><br />

        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" OnCheckedChanged="CheckBox1_CheckedChanged"

            Text="C#" />

        <br />

        <asp:CheckBox ID="CheckBox2" runat="server" AutoPostBack="True" OnCheckedChanged="CheckBox2_CheckedChanged"

            Text="Java" />

        <br />

        <asp:CheckBox ID="CheckBox3" runat="server" AutoPostBack="True" OnCheckedChanged="CheckBox3_CheckedChanged"

            Text="VB" />

 

When you check the checkbox then CheckedChanged event will fire if  AutoPostBack="True"

 

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)

{

if (CheckBox1.Checked)

Label1.Text = CheckBox1.Text;

}

 

protected void CheckBox2_CheckedChanged(object sender, EventArgs e)

{

if (CheckBox2.Checked)

{

Label1.Text = CheckBox2.Text;

}

if (CheckBox2.Checked & CheckBox1.Checked)

{

Label1.Text = CheckBox1.Text + CheckBox2.Text;

}

      

}

 

protected void CheckBox3_CheckedChanged(object sender, EventArgs e)

{

if (CheckBox3.Checked)

Label1.Text = CheckBox3.Text;

}

 

Checkbox Control in ASP.Net

When you check the checkbox then CheckedChanged event will fire and it will show the checked value in the Label.

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