protected void btnIssue_Click(object sender, EventArgs e) { lblEMsg.Visible = false; string[] iBook; try { SqlDataReader sdr; Profile pro = new Profile(); int aQty = Convert.ToInt32(txtQuantity.Text.ToString()); if (aQty == 0) { lblEMsg.Visible = true; lblEMsg.Text = "This book is Out of stock, please select a different book."; return; } string sql = "SELECT Count(1) FROM Book_Transaction WHERE Book_ID = '" + LstBook.SelectedItem.Text + "' And Member_ID = '" + DropDownList1.SelectedItem.Text + "' And Actual_Return_Date Is Null"; sdr = pro.ReturnMDetails(sql); sdr.Read(); int iB = (int)sdr[0]; if (iB > 0) { lblEMsg.Visible = true; lblEMsg.Text = "This book is already issued, please select a different book."; return; } sdr.Close(); //Insert the data. iBook = new string[4]; iBook[0] = LstBook.SelectedItem.Text; iBook[1] = DropDownList1.SelectedItem.Text; iBook[2] = txtIDate.Text; iBook[3] = txtRDate.Text; bool status; status = pro.IssueBook(iBook); if (status == false) { lblEMsg.Visible = true; lblEMsg.Text = "Book Issuing Failed"; } lblEMsg.Visible = true; lblEMsg.Text = "Book Issued."; DropDownList1.Text = ""; LstBook.Text = ""; txtBTitle.Text = ""; txtAuthor.Text = ""; txtPub.Text = ""; txtCat.Text = ""; txtSup.Text = ""; txtQuantity.Text = ""; txtPrice.Text = ""; txtRDate.Text = ""; Label9.Text = ""; return; } catch (Exception ex) { lblEMsg.Visible = true; lblEMsg.Text = ex.Message; } }