ASP.Net ต้องการเปลี่ยนหัวข้อ ตารางใน GridView ต้องเขียนอย่างไรครับ

protected void Page_Load(object sender, EventArgs e)
        {
            SqlDatabaseManager SqlDatabaseManager1 = new SqlDatabaseManager();
            SqlDatabaseManager1.CommandString = "Select * from tb_member";
            DataTable Dt = new DataTable();
            Dt = SqlDatabaseManager1.ExecuteQuery();
            
            GridView1.DataSource = Dt;
            GridView1.DataBind();
        }

<form id="form1" runat="server">
    <div>
        <br />
        <asp:GridView ID="GridView1" runat="server">
        
        <Columns>
        <asp:HyperLinkField
        DataNavigateUrlFields="CustomerID,Name,Email,CountryCode,Budget,Used"
        DataNavigateUrlFormatString="TestSqlConnection.aspx?CustomerID={0}&Name={1}&Email={2}&CountryCode={3}&Budget={4}&Used={5}"
        DataTextField="CustomerID"
        HeaderText="รหัสพนักงาน">
        </asp:HyperLinkField>
                    <asp:CommandField ShowEditButton="True" />
        </Columns>
        </asp:GridView>
        
        <br />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
        <br />
        <br />
        <br />
    </div>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="บันทึก" />
    &nbsp;
    <asp:Button ID="Button3" runat="server" Text="แก้ไข" onclick="Button3_Click" />
&nbsp;
    <asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="ลบ" />
&nbsp;
    <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="ยกเลิก" />
&nbsp;</form>