2.default.aspx.cs 
protected void Page_Load(object sender, EventArgs e) 
 { 
 } 
 protected void Button1_Click(object sender, EventArgs e) 
 { 
 for (int i = 0; i < this.CheckBoxList1.Items.Count; i++) 
 { 
 if (this.CheckBoxList1.Items[i].Selected == true) 
 { 
 this.CheckBoxList1.Items[i].Text = this.CheckBoxList1.Items[i].Text.IndexOf("font") == -1 ? "" + this.CheckBoxList1.Items[i].Text + "" : this.CheckBoxList1.Items[i].Text.Replace("Black", "red"); 
 } 
 else 
 { 
 this.CheckBoxList1.Items[i].Text =this.CheckBoxList1.Items[i].Text.IndexOf("font") == -1 ? "" + this.CheckBoxList1.Items[i].Text + "" : this.CheckBoxList1.Items[i].Text.Replace("red", "Black"); 
 } 
 } 
 } 
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