Question

I did sql command with SqlDataReader but I had this error

System.IndexOutOfRangeException: UserName

Page Load event:

protected void Page_Load(object sender, EventArgs e)
{
    using (SqlConnection con = Connection.GetConnection())
    {

        SqlCommand Com = new SqlCommand("Total", con);
        Com.CommandType = CommandType.StoredProcedure;
        SqlDataReader Dr = Com.ExecuteReader();
        if (Dr.Read())
        {
            string Result= Dr["UserName"].ToString();
            Lbltotal.Text = Result;
        }
    }
}

Stored Procedure:

Alter proc Total
as
begin
select Count (UserName) from Registration 
end

Answer 1

Change your storder procedure to:

Alter proc Total
as
begin
select Count (UserName) as UserName from Registration 
end