Use Of Validation without validator In C#

Here is code of validation of Textbox and dropdown.I have included Register Page image also.
Use Namespace: using System.Text.RegularExpressions;


protected void create_account_Click(object sender, ImageClickEventArgs e)
    {
        Label1.Visible = true;
        if (txtname.Text == "" || txtmobileno.Text == "" || txtphoneno.Text == "" || txtemail.Text == "")
        {
            Label1.Text = "All Fields are Mandatory";
        }
        else if(drpmemtype.SelectedValue=="Select")
        {
            Label1.Text="Please Click Member Type.";
        }
        else if ( !Regex.IsMatch(txtname.Text, @"^[a-zA-Z''-'\s]{1,40}$"))
        {
            Label1.Text = "Please Enter Your Correct Name.";
        }
        else if (txtaddress.Text == "")
        {
            Label1.Text = "Please Enter Address";
        }
        else if (DDLCity.SelectedValue == "Select")
        {
            Label1.Text = "Please Select City";
        }
        else if (DropLocality.SelectedValue == "Select")
        {
            Label1.Text = "Please Select Locality";
        }
        else if (!Regex.IsMatch(txtmobileno.Text, "^[0-9]{10}$"))
        {
            Label1.Text = "Please Inter Valid Mobile No.";
        }
      
        else if (!Regex.IsMatch(txtphoneno.Text, "^[0-9]{11}$"))
        {
            Label1.Text = "Please Enter Valid Phone No";
        }
        else if (DrpGender.SelectedValue == "Select")
        {
            Label1.Text = "Please Select Gender";
        }
        else if (!Regex.IsMatch(txtemail.Text, @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"))
        {
            Label1.Text = "Please Fill Valid Email.";
        }
        else if (txtpassword.Text == "")
        {
            Label1.Text = "Please Fill Password";
        }
      
        else
        {
          <-- Write Here Sql Command For Submission -->
            cmd.Parameters.AddWithValue("@Coumn1", txtname.Text);
            cmd.Parameters.AddWithValue("@Coumn2", txtaddress.Text);
            cmd.Parameters.AddWithValue("@Coumn3", DDLCity.SelectedItem.Text);
          



Abhishek Kumar
http://abhishekkumar.in
Redeemer Engisoft Pvt.Ltd

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