Error Provider to validate the text in a TextBox
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
public class ErrorForm : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button btnValidate;
private System.Windows.Forms.ErrorProvider errorProvider1;
private System.Windows.Forms.TextBox txtInput;
public ErrorForm()
{
InitializeComponent();
CenterToScreen();
}
private void InitializeComponent()
{
this.errorProvider1 = new System.Windows.Forms.ErrorProvider();
this.label1 = new System.Windows.Forms.Label();
this.txtInput = new System.Windows.Forms.TextBox();
this.btnValidate = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// errorProvider1
//
this.errorProvider1.BlinkRate = 500;
this.errorProvider1.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.AlwaysBlink;
//
// label1
//
this.label1.Location = new System.Drawing.Point(8, 8);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(376, 56);
this.label1.TabIndex = 2;
this.label1.Text = "The following text box only allows 5 characters.";
//
// txtInput
//
this.txtInput.Location = new System.Drawing.Point(144, 80);
this.txtInput.Name = "txtInput";
this.txtInput.Size = new System.Drawing.Size(120, 20);
this.txtInput.TabIndex = 0;
this.txtInput.Text = "";
this.txtInput.Validating += new System.ComponentModel.CancelEventHandler(this.txtInput_Validating);
//
// btnValidate
//
this.btnValidate.Location = new System.Drawing.Point(16, 72);
this.btnValidate.Name = "btnValidate";
this.btnValidate.Size = new System.Drawing.Size(112, 32);
this.btnValidate.TabIndex = 1;
this.btnValidate.Text = "OK";
//
// ErrorForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(400, 125);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label1,
this.btnValidate,
this.txtInput});
this.Name = "ErrorForm";
this.Text = "Error Trapper";
this.ResumeLayout(false);
}
static void Main()
{
Application.Run(new ErrorForm());
}
private void txtInput_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
if(txtInput.Text.ToString().Length > 5) {
errorProvider1.SetError( txtInput, "Can't be greater than 5!");
}
else{
errorProvider1.SetError(txtInput, "");
}
}
}
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