Enable Disable DropDownList inside GridView based on CheckBox in ASP.Net

Here i have shown you how to hide Data of DropDownList and DropDownList itself on click of CheckBox.

HTML:

<form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="ddlEmployees" runat="server">
        </asp:DropDownList>
        <br />
        <asp:CheckBox ID="cbShowHide" runat="server" Text="Show Hide DropDownList" AutoPostBack="true"
            OnCheckedChanged="OnCheckedChanged_ShowHide" />
        <br />
        <asp:CheckBox ID="cbShowHideData" runat="server" Text="Show Hide Data" AutoPostBack="true"
            OnCheckedChanged="OnCheckedChanged_ShowHideData" />
    </div>
    </form>

protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                this.PopulateDropDownList();
            }
        }

        private void PopulateDropDownList()
        {
            string constr = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand("SELECT FirstName,EmployeeID FROM Employees", con))
                {
                    using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                    {
                        con.Open();
                        DataSet ds = new DataSet();
                        da.Fill(ds);
                        this.ddlEmployees.DataTextField = "FirstName";
                        this.ddlEmployees.DataValueField = "EmployeeID";
                        this.ddlEmployees.DataSource = ds;
                        this.ddlEmployees.DataBind();

                    }
                }
            }
        }

        //for Hiding DropDownList
        protected void OnCheckedChanged_ShowHide(object sender, EventArgs e)
        {
            this.ddlEmployees.Visible = this.cbShowHide.Checked == true ? false : true;
        }

        //for hiding DropDownList Data
        protected void OnCheckedChanged_ShowHideData(object sender, EventArgs e)
        {
            if (this.cbShowHideData.Checked)
            {
                ddlEmployees.Items.Clear();
            }
            else
            {
                this.PopulateDropDownList();
            }
        }