How to disable a checkbox if another checkbox is enabled? C#

My web-page have two check-boxes and What I want is:

• Initially both check-boxes are unchecked.
• if Checkbox1 is checked, Checkbox2 should becomes disabled.
• if Checkbox2 is unchecked again, Checkbox2 should becomes enabled again.
• and vice versa.

Please help me in modifying my code..

Here is my code:

protected void CheckBox1_CheckedChanged1(object sender, EventArgs e)
{
   //this.CheckBox1.CheckedChanged += new System.EventHandler(CheckBox1_CheckedChanged1);
    if (CheckBox1.Checked)
        CheckBox2.Enabled = false;
}

protected void CheckBox2_CheckedChanged2(object sender, EventArgs e)
{
    if (CheckBox2.Checked)
        CheckBox1.Enabled = false;
}

HTML

<asp:CheckBox ID="CheckBox1" runat="server" Height="33px" OnCheckedChanged="CheckBox1_CheckedChanged1" Font-Bold="True" style="margin-left: 33px" Text="Remove Blank Lines" TextAlign="Left" Width="162px" />


<asp:CheckBox ID="CheckBox2" runat="server" Font-Bold="True" Height="33px" OnCheckedChanged="CheckBox2_CheckedChanged2" style="margin-left: 28px" Text="Add Prefix/ Suffix to Blank Lines" TextAlign="Left" Width="259px" />