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Control Validation using C#.net

Step by step to Control Validation:
 
   Add a Form
    Go to Form Property window.
    Disable Auto Validate .
    Add a Text Box in the Form.
    Add a Button in the Form.
    Verify Causes Validation is true.


if (textBox1.Text.Length == 0)
 { 
e.Cancel = true;
 }
 else
 {
 e.Cancel = false; 
}
 if (this.ValidateChildren())
 { 
MessageBox.Show("Validation succeeded!");
 }
 else
 {
 MessageBox.Show("Validation failed.");
 }

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