attempt to execute SLQ not working

I am hosting my website with a web hosting company on the web. My web application reads
data from a SQL server 2005 database. So far I have been able to establish a connection
to the database, but when I attempt to query data from a table, I a get an error message.
I can't figure out what I am doing wrong here.basically I just want to read data from a
column in the database and to store it into a multi-line textbox control. I am using some
inline sql for the call. Can someone help me out here?

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) { }
protected void Button1_Click(object sender, EventArgs e)
{
mySqlConnection = new SqlConnection(ConnectionStringConst);
mySqlConnection.Open();
try
{
// Database is named "Torsion", Table I am querying is named "Content"
SqlCommand cmd = new SqlCommand("SELECT * FROM [Torsion].[dbo].[Content] ORDER BY [Section] DESC", mySqlConnection);
rdr = cmd.ExecuteReader();
ListBox1.DataSource = rdr[0];
ListBox1.DataTextField = "HLContent"; // HLContent is the first column in my database
ListBox1.DataBind(); // I want to store HLContent into ListBox1 control
}
catch { throw;}
finally
{ mySqlConnection.Close();
mySqlConnection.Dispose();
}
}
}
-------------ERROR_MESSAGE_BELOW---------

Server Error in '/' Application.

---

Invalid attempt to read when no data is present.

Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details:System.InvalidOperationException: Invalid attempt to read when no data is present.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: Invalid attempt to read when no data is present.] System.Data.SqlClient.SqlDataReader.GetValue(Int32 i) +137 System.Data.SqlClient.SqlDataReader.get_Item(Int32 i) +7 _Default.Button1_Click(Object sender, EventArgs e) +167 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

---

Version Information: Microsoft .NET Framework Version:2.0.50727.832; ASP.NET Version:2.0.50727.832

Can you please check whether data is available in the table.

In the code can please check for the null before assingning to the list box. It is as follows:

rdr = cmd.ExecuteReader();

if(rdr != null)
{

ListBox1.DataSource = rdr[0];
ListBox1.DataTextField = "HLContent"; // HLContent is the first column in my database
ListBox1.DataBind(); // I want to store HLContent into ListBox1 control

}

And also please make sure that the DataReader object is also closed, which is nothing to do with the error but it is recommended for the DataReader.

|||The table does have one record in it. The exception is thrown when

cmd.ExecuteReader();

is executed.

|||

u need to specify whether the commandtype is text or stored procedure