Question

Datareader Invalid Attempt to read when no data is present

Asked by: Scripter25

Why am I getting this message I checked the sql behind it and it is returning one row and there is a value in the first column so it should work with no problem.

        SqlConnection sqlConnection1 = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\ASPNETDB.mdf;Integrated Security=True;User Instance=True");
        SqlCommand cmd = new SqlCommand();
        MembershipUser myObject = Membership.GetUser();
        string userIDD = myObject.ProviderUserKey.ToString();
        cmd.CommandText = "GetCustInfo";
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Connection = sqlConnection1;
        cmd.Parameters.AddWithValue("@userID", userIDD);
        sqlConnection1.Open();
        SqlDataReader DReader = cmd.ExecuteReader();
       
        profile_ID = Convert.ToInt32(DReader.GetValue(0));

The error I am getting is "Invalid Attempt to read when no data is present" and it is on
profile_ID = Convert.ToInt32(DReader.GetValue(0));

Here is the extended error


System.InvalidOperationException was unhandled by user code
  Message="Invalid attempt to read when no data is present."
  Source="System.Data"
  StackTrace:
       at System.Data.SqlClient.SqlDataReader.GetValue(Int32 i)
       at GetCustomerProfile.GetCustProfile(String UserID) in c:\Documents and Settings\Scott\My Documents\Visual Studio 2005\WebSites\AjaxSigns2\App_Code\GetCustomerProfile.cs:line 157
       at GetCustomerProfile..ctor(String UserID) in c:\Documents and Settings\Scott\My Documents\Visual Studio 2005\WebSites\AjaxSigns2\App_Code\GetCustomerProfile.cs:line 26
       at storeCheckout.Wizard1_FinishButtonClick1(Object sender, WizardNavigationEventArgs e) in c:\Documents and Settings\Scott\My Documents\Visual Studio 2005\WebSites\AjaxSigns2\storeCheckout.aspx.cs:line 151
       at System.Web.UI.WebControls.Wizard.OnFinishButtonClick(WizardNavigationEventArgs e)
       at System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e)
       at System.Web.UI.WebControls.Wizard.WizardChildTable.OnBubbleEvent(Object source, EventArgs args)
       at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
       at System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e)
       at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
       at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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Asked On
2007-08-29 at 22:58:27ID22796507
Tags

data

,

read

,

attempt

,

when

,

invalid

Topics

Programming for ASP.NET

,

.NET Framework 2.x

,

C# Programming Language

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: JimBrandleyPosted on 2007-08-29 at 23:05:27ID: 19797765

You need to switch it to something like this:
while (DReader.Read())
{
   index = 0;
   while (index < colCount)
   {
      something= DReader[index];
     // OR
     something = DReader.GetValue(0);
      index++;
   }
}
DReader.Close();
DReader.Dispose();
// and CloseConnection();

Jim

 

by: udhayakumardPosted on 2007-08-29 at 23:14:58ID: 19797804


try
{

       SqlConnection sqlConnection1 = new SqlConnection("Data      Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\ASPNETDB.mdf;Integrated Security=True;User Instance=True");
        SqlCommand cmd = new SqlCommand();
        MembershipUser myObject = Membership.GetUser();
        string userIDD = myObject.ProviderUserKey.ToString();
        cmd.CommandText = "GetCustInfo";
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Connection = sqlConnection1;
        cmd.Parameters.AddWithValue("@userID", userIDD);
        sqlConnection1.Open();
        SqlDataReader DReader = cmd.ExecuteReader();

        while  (DReader .Read())
        {
                 profile_ID = DReader[0];
        }
}
finally
{
             // close the reader
             if (DReader != null)
             {
                 DReader .Close();
             }
 
             // Close the connection
             if (sqlConnection1 != null)
             {
                 sqlConnection1 .Close();
             }
}

 

by: Scripter25Posted on 2007-08-29 at 23:19:23ID: 19797823

Not quite sure which one of you apply the points to

This is what I got and it works now



        SqlDataReader DReader = cmd.ExecuteReader();
        while (DReader.Read())
        {
            if (DReader.HasRows)
            {
                profile_ID = Convert.ToInt32(DReader.GetValue(0));
                userID = Convert.ToString(DReader.GetValue(1));
                profile_company = Convert.ToString(DReader.GetValue(2));
                profile_fName = Convert.ToString(DReader.GetValue(3));
                profile_lName = Convert.ToString(DReader.GetValue(4));
                profile_phone = Convert.ToString(DReader.GetValue(5));
                profile_add1 = Convert.ToString(DReader.GetValue(6));
                profile_add2 = Convert.ToString(DReader.GetValue(7));
                profile_city = Convert.ToString(DReader.GetValue(8));
                profile_state = Convert.ToString(DReader.GetValue(9));
                profile_zip = Convert.ToString(DReader.GetValue(10));
                profile_bAdd1 = Convert.ToString(DReader.GetValue(11));
                profile_bAdd2 = Convert.ToString(DReader.GetValue(12));
                profile_bCity = Convert.ToString(DReader.GetValue(13));
                profile_bState = Convert.ToString(DReader.GetValue(14));
                profile_bZip = Convert.ToString(DReader.GetValue(15));
            }
        }

 

by: JimBrandleyPosted on 2007-08-29 at 23:24:04ID: 19797836

That looks good as long as it only returns one row. DataReaders are generally used as FastForward ReadOnly cursors to get multiple rows quickly. Obviously if you get two or more rows, earlier values will be lost.

Jim


 

by: Scripter25Posted on 2007-08-29 at 23:30:39ID: 19797857

yeah that is why my select statement has TOP (1) so that it only returns one row even though it shouldnt ever return more then one row anyhow I put that in as a precaution

 

by: JimBrandleyPosted on 2007-08-30 at 00:18:55ID: 19798019

Excellent idea. Good luck.

Jim

20120131-EE-VQP-002

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