validation in c#

Question

how to validation in c# all types of validation in c# i want? please replay......

Satyapriya Nayak · Answer

Blank validation on textbox Method-1 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 Validation_on_textbox { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender EventArgs e) { if (textBox1.Text == ) { MessageBox.Show(Name Field cannnot be blank); textBox1.Focus(); } else { MessageBox.Show(Correct); } clear(); } private void clear() { textBox1.Text = ; } } } Method-2 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 Validation_on_textbox { public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void button1_Click(object sender EventArgs e) { foreach (Control c1 in this.Controls) { if (c1 is TextBox) { if (c1.Text == ) { MessageBox.Show(Name Field cannnot be blank); c1.BackColor = Color.Orange; textBox1.Focus(); } else { MessageBox.Show(Correct); c1.BackColor = Color.White; } } } clear(); } private void clear() { textBox1.Text = ; } } } Method-3 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 Validation_on_textbox { public partial class Form3 : Form { public Form3() { InitializeComponent(); } private void button1_Click(object sender EventArgs e) { if (textBox1.Text.Trim() == ) { errorProvider1.SetError(textBox1 Name Field cannnot be blank); textBox1.Focus(); } else { errorProvider1.Clear(); MessageBox.Show(Correct); } clear(); } private void clear() { textBox1.Text = ; } } }

Sunny Sharma · Answer

Dear Ravindra Please consider to decorate the question properly so that one can understand your problems/requirements properly. I also encourage to do some Googling before you share your problems. We're to help not to do your homework. Below is the link where you can grab a lot of them: Validation in C# Hope this helps ! Thanks Sunny K