SQLBulkCopy not copying data to database but there is no error..

i used breakpoints and checked the values..they are same as getting copied to database. int fields store 0, datetime fields store 01-01-0001 value, and string fields null values.    and row.cells  for all fields is '' ''.

protected void btnGetUsedStock_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[9] { new DataColumn("CatheterCat", typeof(string)),
                new DataColumn("CatID", typeof(int)),
                new DataColumn("Date",typeof(DateTime)),
                new DataColumn("DC No", typeof(int)),
                new DataColumn("Company", typeof(string)),                      
                new DataColumn("Name", typeof(string)),
                new DataColumn("Size", typeof(string)),
                new DataColumn("Batch", typeof(string)),
                new DataColumn("Expiry",typeof(DateTime)),});

    foreach (GridViewRow row in GridView1.Rows)
    {
        if ((row.FindControl("chkSelect") as CheckBox).Checked)
        {
            string dd1 = row.Cells[1].Text;
            //DropDownList ddl = (DropDownList)row.FindControl("DropDownList1");
            // int catid = Int32.Parse(row.Cells[2].Text);
            //DateTime date = DateTime.Parse(row.Cells[3].Text);
            int catid;
            int.TryParse(row.Cells[2].Text, out catid);
            DateTime date;
            DateTime.TryParse(row.Cells[3].Text, out date);
            int dcno;
            int.TryParse(row.Cells[4].Text, out dcno);
            //int dcno =Int32.Parse( row.Cells[4].Text);
            string company = row.Cells[5].Text;

            string name = row.Cells[6].Text;
            string size = row.Cells[7].Text;
            string batch = row.Cells[8].Text;
            DateTime exp;
            DateTime.TryParse(row.Cells[9].Text, out exp);
            //DateTime exp = DateTime.Parse(row.Cells[9].Text);
            dt.Rows.Add(dd1, catid, date.Date,dcno, company, name, size, batch, exp.Date);
        }
    }
    if (dt.Rows.Count > 0)
    {
        string consString = WebConfigurationManager.ConnectionStrings["ConnectString"].ConnectionString;
        using (SqlConnection con = new SqlConnection(consString))
        {
            using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(con))
            {
                //Set the database table name
                sqlBulkCopy.DestinationTableName = "dbo.Tbl_Catheterusagestock";

                //[OPTIONAL]: Map the DataTable columns with that of the database table
                sqlBulkCopy.ColumnMappings.Add("CatheterCat", "CathCat");
                sqlBulkCopy.ColumnMappings.Add("CatID", "CathID");
                sqlBulkCopy.ColumnMappings.Add("Date", "Date");
                sqlBulkCopy.ColumnMappings.Add("DC No", "DCNo");
                sqlBulkCopy.ColumnMappings.Add("Company", "Company");

                sqlBulkCopy.ColumnMappings.Add("Name", "Name");
                sqlBulkCopy.ColumnMappings.Add("Size", "Size");
                sqlBulkCopy.ColumnMappings.Add("Batch", "Batch");
                sqlBulkCopy.ColumnMappings.Add("Expiry", "Expiry");
                con.Open();
                sqlBulkCopy.WriteToServer(dt);
                con.Close();
            }
        }