public FrmAddDona() { InitializeComponent(); categoriescombo.DataSource = Dona.GET_ALL_CATEGORIES(); categoriescombo.DisplayMember = "Description"; categoriescombo.ValueMember = "ID"; DonatorID.Focus(); }
private void DonatorID_TextChanged(object sender, EventArgs e) { bool containsLetter = false; string text1 = DonatorID.Text.Trim(); for (int i = 0; i < text1.Length; i++) { if (!char.IsNumber(text1[i])) { containsLetter = true; } } if (containsLetter) { MessageBox.Show("error string in number", "error", MessageBoxButtons.OK, MessageBoxIcon.Error); if (MessageBox.Show("do you want to clear the text and start again? ", "clear حقل الكمية", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes) { DonatorID.Clear(); } } }