Question

try
        {
            String empid1 = Request.QueryString["MyText"];

            int empid = int.Parse(empid1);
            string constr = System.Configuration.ConfigurationManager.ConnectionStrings["EmployeeDatabase"].ConnectionString;
            SqlConnection con = new SqlConnection(constr);
            con.Open();
            SqlCommand cmd = new SqlCommand("ReportingManagers", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add("@EmpID", SqlDbType.Int, 0).Value = empid;

            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            LinkButton3.Text = string.Empty;
            int i = 1;
             while(dr.Read())
            {


                TreeNode parentNode = new TreeNode("L" + i++ + "Manager : " + dr["Emp_Name"].ToString());
                parentNode.Value = dr["Emp_ID"].ToString();
                TreeView1.Nodes.Add(parentNode);
                parentNode.ChildNodes.Add(new TreeNode("Short ID : " + dr["Short_ID"].ToString()));
                parentNode.ChildNodes.Add(new TreeNode("EmpID : " + dr["Emp_ID"].ToString()));
              //  LinkButton3.Text = "Reporting Managers";  
            }

             DataTable dt = new DataTable();
             dt.Load(dr);
             if (dt.Rows.Count > 1)
             {
                 LinkButton3.Text = "Reporting Managers";  
             }

            dr.Close();
            con.Close();
        }

Please explain me why my if loop is not getting executed in the above code. I can see that in datatable dt I got row count ‘0’ but my dr is showing true for has rows..I dont wnat to use sql adapter in this scenerio.

How can i capture row count of data table in this scenario?

Answer 1

You can’t load a datatable with a datareader that has already been used to the end of its data.
Try to change the order of your code execution in this way

SqlDataReader dr = cmd.ExecuteReader();
LinkButton3.Text = string.Empty;
int i = 1;
DataTable dt = new DataTable();
dt.Load(dr);
if (dt.Rows.Count > 1)
{
    LinkButton3.Text = "Reporting Managers";  
    foreach(DataRow r in dt.Rows)
    {
        TreeNode parentNode = new TreeNode("L" + i++ + "Manager : " + r["Emp_Name"].ToString());
        parentNode.Value = r["Emp_ID"].ToString();
        TreeView1.Nodes.Add(parentNode);
        parentNode.ChildNodes.Add(new TreeNode("Short ID : " + r["Short_ID"].ToString()));
        parentNode.ChildNodes.Add(new TreeNode("EmpID : " + r["Emp_ID"].ToString()));
    }
}