private void tsbSearch_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
if (txtCondition.Text == "")
{
this.showErrorMessage("ป้อนข้อมูลที่จะค้นหาก่อน");
return;
}
BookType booktype = new BookType();
bool isnumeric = int.TryParse(txtCondition.Text, out int BookTypeID);
if (isnumeric)
{
booktype.BookTypeID = BookTypeID;
dt = booktype.searchByID();
}
else // ไม่ใช่ตัวเลข
{
booktype.BookTypeName = txtCondition.Text;
dt = booktype.searchByName();
}
dgvBookType.DataSource = dt;
}