//Inventory Tab - Runs a sql query with every keystroke within searchTextbox. private void InventorySearchTextbox_TextChanged(object sender, EventArgs e) { if (inventoryGridIndex == 0) { inventoryGridIndex = 1; } if (String.IsNullOrEmpty(InventorySearchTextbox.Text)) { Inventory.DisplayInventory(InventoryDataGrid, con); } else if (System.Text.RegularExpressions.Regex.IsMatch(InventorySearchTextbox.Text, "^[a-zA-Z0-9]")) { Inventory.InventorySearch(InventoryDataGrid, InventoryFilterCombo.Text, InventorySearchTextbox.Text, con); } }