Invalid attempt to callreader when reader is closed

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C#

SqlConnection CON=new SqlConnection(@"Data Source=SATEESH\SQLEXPRESS;Initial Catalog=mydb;Integrated Security=True");
CON.Open();
SqlCommand cmd=new SqlCommand("select * from register",CON);
SqlDataReader rdr = cmd.ExecuteReader();
DataTable dt = new DataTable();
while(rdr.Read())
{
  dt.Load(rdr);
}
dataGridView1.DataSource=dt;

the table contains data and I am getting the above exception.

I googled but unable to figure it out.

Posted 21-Apr-12 22:01pm

satishmachineni

Updated 21-Apr-12 22:26pm

Sandeep Mewara

v2

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2 solutions

Solution 2

Don't see where exactly you are closing your Datareader in above code snippet but the error clearly sounds like you are trying to read data even after closing the reader.

Have a look here on how to retrieve data using DataReader here: Data Using a DataReader[^]

Posted 21-Apr-12 22:33pm

Sandeep Mewara

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satishmachineni 22-Apr-12 4:38am

the above loop solution solved my problem any way thanks for the answer

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OriginalGriff · Accepted Answer · 2012-04-21T22:29:00

Solution 1

Why are you using a loop at all?
The MSDN example for DataTable.Load[^] doesn't, and I can see no reason why you would want to...

C#

SqlCommand cmd=new SqlCommand("select * from register",CON);
SqlDataReader rdr = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(rdr);
dataGridView1.DataSource=dt;

Posted 21-Apr-12 22:29pm

OriginalGriff

Comments

satishmachineni 22-Apr-12 4:37am

yes thanks ,i made changes and got desired result

OriginalGriff 22-Apr-12 5:35am

You're welcome!