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