How to give Validation controls in windows form application c#

Question

How to give Validation controls in windows form application c# How to give provide mandatory fields to user to fill the textboxes and other validation controls

Satyapriya Nayak · Answer

Hi Rashmi using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication21 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender EventArgs e) { if (textBox1.Text ==  || textBox2.Text ==  || textBox3.Text ==  || textBox4.Text ==  || textBox5.Text ==  || textBox6.Text ==  || textBox7.Text ==  || textBox8.Text ==  || comboBox1.Text ==  || comboBox2.Text ==  || comboBox3.Text ==  || comboBox4.Text == ) { MessageBox.Show(Fields cannnot be blank); } else { MessageBox.Show(Insert); } } } private void Form1_Load(object sender EventArgs e) { comboBox1.Items.Add(a); comboBox2.Items.Add(b); comboBox3.Items.Add(c); comboBox4.Items.Add(d); } } } ------------- using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication21 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender EventArgs e) { foreach (Control cnt in this.Controls) { if (cnt is TextBox) { if (cnt.Text == ) { MessageBox.Show(TextBox is Blank.); cnt.BackColor = Color.Pink; } } else if (cnt is ComboBox) { ComboBox cmb = (ComboBox)cnt; if (cmb.SelectedItem == null) { MessageBox.Show(Combox is not Selected.); cnt.BackColor = Color.Plum; } } } } private void Form1_Load(object sender EventArgs e) { comboBox1.Items.Add(a); comboBox2.Items.Add(b); comboBox3.Items.Add(c); comboBox4.Items.Add(d); } } } ------------- private void btnSave_Click(object sender EventArgs e) { ErrorTracker et = new ErrorTracker(errorProvider1); if (TextBox1.Text.Trim() == ) { et.SetError(TextBox1 Required !); } if (TextBox2.Text.Trim() == ) { et.SetError(TextBox2 Required !); } if (TextBox3.Text.Trim() == ) { et.SetError(TextBox3 Required !); } if (TextBox4.Text.Trim() == ) { et.SetError(TextBox4 Required !); } int a = et.Count; if (!(a > 0)) { errorProvider1.Clear(); this.SavePatientMessage(); } } Thanks