this.tblReagent_rTableAdapter.Fill(this.dataDataSet.tblReagent_r);
           // biIDTextBox.Enabled = false;
            if (biID == "")
            {
            tblReagent_rBindingSource.Filter = "biID IS NULL";
            tblReagent_rBindingSource.AddNew();
           
            }
            else
            {
            biIDTextBox.Text = biID;
            tblReagent_rBindingSource.Filter = "biID = '" + biID + "'";
            }

tblReagent_rBindingSource.Filter = "biID = '" + biID + "'";

private void button2_Click(object sender, EventArgs e)
        {
         for (int i = 0; i < tblReagent_rDataGridView.RowCount - 1; i++)
         {
         tblReagent_rDataGridView[1, i].Value = biIDTextBox.Text;
         }

        }