protected void btncheckavail_Click(object sender, EventArgs e)
{
scn.Open();
SqlCommand cmd = new SqlCommand("select userid from Registration where userid='" + txtuserid.Text + "'", scn);
string str = Convert.ToString(cmd.ExecuteScalar());
if (str =="")
{
lbl.Text = UserID is Available
}
else
{
lbl.Text = "This UserID is Already Exists";
lbl.Visible = true;
}
}
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