Multiple Insert transaction connection timeout - ADO.NET - SQL Server

Question

I have a transaction with multiple inserts. All of the inserts work fine, except one. I verified the parameters, the spelling, all of it, and it seems I'm not figuring it out. It gives me the error:

Timeout expired. The timeout period elapsed prior to completion of the operation 
or the server is not responding.

My transaction looks like this:

SqlConnection db = new SqlConnection(connString);
DataSet dataSet = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
using (db)
{
    db.Open();
    SqlTransaction trans = db.BeginTransaction();
    try
    {
        //insert into COMMSignalDefinition !!Problem HERE
        da.InsertCommand = 
            new SqlCommand("INSERT INTO COMMSignalDefinition(Name) " 
                           + "VALUES (@name)", db, trans);

        da.InsertCommand.Parameters.Add("@name", SqlDbType.NVarChar);
        foreach (DataRow row in ds.Tables["COMMTerminalSignal"].Select())
        {
            da.InsertCommand.Parameters[0].Value = row.ItemArray[1];
            da.InsertCommand.ExecuteNonQuery();
        }

        // insert into COMMSignalExceptionDefinition -- names
        da.InsertCommand = 
            new SqlCommand("INSERT INTO COMMSignalExceptionDefinition(Name) " 
                           + "VALUES (@name)", db, trans);
        da.InsertCommand.Parameters.Add("@name", SqlDbType.NVarChar);
        foreach (DataRow row in ds.Tables["COMMSignalExceptionDef"].Select())
        {
            da.InsertCommand.Parameters[0].Value = row.ItemArray[1];
            da.InsertCommand.ExecuteNonQuery();
        }

        trans.Commit();
        MessageBox.Show("You have successfully imported your Settings. " 
                        + "You can now exit the program.", 
                         "Success",
                         MessageBoxButtons.OK, 
                         MessageBoxIcon.Information);
    }
    catch (Exception e)
    {
        trans.Rollback();
        MessageBox.Show(e.Message,
                        "Error", 
                        MessageBoxButtons.OK, 
                        MessageBoxIcon.Error);
    }
}

I have more inserts which work fine (I deleted the rest of them) and I moved the one with problems at the beginning. My question is what could I possibly do wrong? I even verified if the "problematic" query is sent to the server, with SQL Server Profiler, and it does! And if I execute it in SQL Server Management studio, it works too.

Connection Timeout is set to 30

Can You please give me some leads ? SQL Server version is 2005 ! Thank You!

Answer 1

Please delete this post. I'm so ashamed of me... After hours of digging, it came out I did some tests in Management Studio, where I tested some transactions without committing them at all. So it was waiting for a commit, and I kept making, or trying to make inserts ... ! Shame on me ! Sorry about this.

Answer 2

If this is a pretty long running operation, you can try to change the Command Timeout.

Answer 3

1. Check your connection string. Maybe you have some mistake in your connString var
2. Check your SqlDataAdapter command timeouts. They may be the cause of the exception (see http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout.aspx) Usually such exception is the result of either long running tasks or uncommitted transactions.

Answer 4

Connection Timeout is set to 1

SqlConnection.ConnectionTimeout Property

The time (in seconds) to wait for a connection to open. The default value is 15 seconds.

So you have set the timout to 1 second. Does that answer your question?

Remarks: You can set the amount of time a connection waits to time out by using the ConnectTimeout or Connection Timeout keywords in the connection string. A value of 0 indicates no limit, and should be avoided in a ConnectionString because an attempt to connect waits indefinitely.