User-707554951 posted
Hi arwa55,
Using the following code:
<asp:CheckBox ID="CheckBox1" runat="server" Text="CheckBox1" ForeColor="#FF3300" AutoPostBack="true" OnCheckedChanged="CheckBox1_CheckedChanged"/>
CodeBehind:
using System.Drawing;
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
if (CheckBox1.Checked)
{
CheckBox1.ForeColor = Color.Green;
}
else
{
CheckBox1.ForeColor = Color.Red;
}
}
Output Screenshot as below:

Best Regards
Cathy