<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ErrorMessage="Enter valid description" ControlToValidate="TextBox1" ValidationExpression="[0-9]+" ValidationGroup="val1"></asp:RegularExpressionValidator>

First desing the page like following way

First Design The page take one Gridview.

The Following is .aspx page design

First create procedure. . .

ALTER PROCEDURE dbo.user1
    @id int=0       
AS
           select * from user_reg where uid=@id;

           RETURN

Write the following code in Button click event

 protected void Button1_Click(object sender, EventArgs e)
    {

        con.Open();
        SqlDataAdapter adp = new SqlDataAdapter("select * from com_register where uname='" + TextBox1.Text + "' AND pass='" + TextBox2.Text + "'", con);
        System.Data.DataTable dt = new DataTable();

First  create the procedur as follow. . .

ALTER PROCEDURE dbo.loginpro
     @email varchar(50),
    @pass varchar(50),
    @u_id int=0,
    @id int=null output
AS
      select @u_id=uid from user_reg where uemailid=@email and upass=@pass;
    set @id=@u_id
    RETURN @id

Following is the .aspx file code write this first. . .
<script type="text/javascript">
        function showNestedGridView(obj) {
            var nestedGridView = document.getElementById(obj);
            var imageID = document.getElementById('image' + obj);

            if (nestedGridView.style.display == "none") {
                nestedGridView.style.display = "inline";
                imageID.src = "minus.png";
            } else {
                nestedGridView.style.display = "none";
                imageID.src = "plus.png";
            }
        }
</script>
<br />
<br />
<br />
<center>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"
        DataKeyNames="pid" ShowFooter="True"
        onrowdatabound="GridView1_RowDataBound"
        onrowcommand="GridView1_RowCommand">
        <Columns>