SQL Error - Saving gridview data to SQL database table

Hi,

I am trying to save gridview data to a database table by means of the following code attached.  I tested the query, and it works fine.  I am getting an error at line:

"cmd.ExecuteNonQuery();"

Error:  A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The handle is invalid.)

protected void Save_Click(object sender, ImageClickEventArgs e)
        {
            foreach (GridViewRow gvr in GridView2.Rows)  
            {
                SqlConnection Conn = new SqlConnection();
                Conn.ConnectionString = "ConnectionString";

                string SqlString = "insert into [Applied_DailyHrs](Name,Employee_ID, DailyHrsDate, Rules SRay_ID, ProductLine, Calc_first_clock, Calc_last_clock, Calc_work_Start, Calc_work_end, Worked_Hrs, Extra_Before, Extra_during, Extra_after, NormalDay) values ("+ "'test2'" + "," + gvr.Cells[0].Text + "," + "'" + gvr.Cells[5].Text  + "' ," + gvr.Cells[1].Text + "," + gvr.Cells[2].Text + "," + "2" + "," + "'" + gvr.Cells[6].Text + "' ," + "'" + gvr.Cells[7].Text + "' ," + "'" + gvr.Cells[8].Text + "' ," + "'" + gvr.Cells[9].Text + "' ," + "'" + gvr.Cells[10].Text + "' ," + "'" + gvr.Cells[11].Text + "' ," +
"'" + gvr.Cells[12].Text + "' ," + "'" + gvr.Cells[13].Text + "' ," + "'" + gvr.Cells[3].Text + "'" + ")"; 

SqlCommand cmd = new SqlCommand(SqlString, Conn);
Conn.Open();
cmd.ExecuteNonQuery();
Conn.Close();
    }

}

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