data can't bind error occuring

private void frmReassignBook_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < this.flex.Cols; i++)
            {
                this.flex.set_ColAlignment(i, 1);
            }
            this.flex.set_ColWidth(0, 700);
            this.flex.set_ColWidth(1, 0x7d0);
            this.flex.set_ColWidth(2, 0x7d0);
            this.flex.set_TextMatrix(0, 0, "Book #");
            this.flex.set_TextMatrix(0, 1, "Assigned to:");
            this.flex.set_TextMatrix(0, 2, "Reassign to:");
            try
            {
                for (int j = 1; j < this.flex.Rows; j++)
                {
                    this.flex.set_TextMatrix(j, 0, j.ToString());
                    DataTable table = new DataTable();
                    table = this.obj.GenralSelect_Method("select pcname,invoice from book where bookname like '" + this.flex.get_TextMatrix(j, 0) + "'").Tables[0];
                    if (table.Rows.Count > 0)
                    {
                        this.flex.set_TextMatrix(j, 1, table.Rows[0][0].ToString());
                        if (table.Rows[0][1].ToString() == "2501")
                        {
                            this.flex.Row = j;
                            for (int k = 0; k < this.flex.Cols; k++)
                            {
                                this.flex.Col = k;
                                this.flex.CellForeColor = Color.Red;
                            }
                        }
                        if (j == 0x63)
                        {
                            this.btnReset.Enabled = true;
                        }
                    }
                    else
                    {
                        this.flex.set_TextMatrix(j, 1, "Unassigned");
                    }
                }
            }
            catch (Exception exception)
            {
                MessageBox.Show(exception.get_Message(), "Error");
            }
            this.flex.Col = 1;
            this.flex.Row = 1;
        }

can any body help me