validate.cs

this is a good book for the visual c#

         // 
         this.addressTextBox.Location = new System.Drawing.Point(100, 100);
         this.addressTextBox.Name = "addressTextBox";
         this.addressTextBox.Size = new System.Drawing.Size(136, 20);
         this.addressTextBox.TabIndex = 18;
         this.addressTextBox.Text = "";
         // 
         // firstTextBox
         // 
         this.firstTextBox.Location = new System.Drawing.Point(100, 65);
         this.firstTextBox.Name = "firstTextBox";
         this.firstTextBox.Size = new System.Drawing.Size(136, 20);
         this.firstTextBox.TabIndex = 17;
         this.firstTextBox.Text = "";
         // 
         // lastTextBox
         // 
         this.lastTextBox.Location = new System.Drawing.Point(100, 30);
         this.lastTextBox.Name = "lastTextBox";
         this.lastTextBox.Size = new System.Drawing.Size(136, 20);
         this.lastTextBox.TabIndex = 16;
         this.lastTextBox.Text = "";
         // 
         // validateForm
         // 
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(312, 341);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.phoneLabel,
                                                                      this.zipLabel,
                                                                      this.stateLabel,
                                                                      this.cityLabel,
                                                                      this.addressLabel,
                                                                      this.firstLabel,
                                                                      this.lastLabel,
                                                                      this.OkButton,
                                                                      this.phoneTextBox,
                                                                      this.zipTextBox,
                                                                      this.stateTextBox,
                                                                      this.cityTextBox,
                                                                      this.addressTextBox,
                                                                      this.firstTextBox,
                                                                      this.lastTextBox});
         this.Name = "validateForm";
         this.Text = "Validate";
         this.ResumeLayout(false);

      }
		#endregion

      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main() 
      {
         Application.Run(new validateForm());
      }

      // handles OkButton Click event
      private void OkButton_Click(object sender, System.EventArgs e)
      {
         // ensures no textboxes are empty
         if ( lastTextBox.Text == "" || firstTextBox.Text == "" ||
            addressTextBox.Text == "" || cityTextBox.Text == "" ||
            stateTextBox.Text == "" || zipTextBox.Text == "" ||
            phoneTextBox.Text == "" )
         {
            // display popup box
            MessageBox.Show( "Please fill in all fields", "Error",
               MessageBoxButtons.OK, MessageBoxIcon.Error );

            // set focus to lastTextBox
            lastTextBox.Focus();

            return;
         }

         // if last name format invalid show message
         if ( !Regex.Match( lastTextBox.Text, 
            @"^[A-Z][a-zA-Z]*$" ).Success )
         {
            // last name was incorrect
            MessageBox.Show( "Invalid Last Name", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            lastTextBox.Focus();

            return;
         }

         // if first name format invalid show message
         if ( !Regex.Match( firstTextBox.Text, 
            @"^[A-Z][a-zA-Z]*$" ).Success )
         {
            // first name was incorrect
            MessageBox.Show( "Invalid First Name", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            firstTextBox.Focus();

            return;
         }

         // if address format invalid show message
         if ( !Regex.Match( addressTextBox.Text, 
            @"^[0-9]+\s+([a-zA-Z]+|[a-zA-Z]+\s[a-zA-Z]+)$" ).Success )
         {
            // address was incorrect
            MessageBox.Show( "Invalid Address", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            addressTextBox.Focus();

            return;
         }

         // if city format invalid show message
         if ( !Regex.Match( cityTextBox.Text, 
            @"^([a-zA-Z]+|[a-zA-Z]+\s[a-zA-Z]+)$" ).Success )
         {
            // city was incorrect
            MessageBox.Show( "Invalid City", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            cityTextBox.Focus();

            return;
         }

         // if state format invalid show message
         if ( !Regex.Match( stateTextBox.Text, 
            @"^([a-zA-Z]+|[a-zA-Z]+\s[a-zA-Z]+)$" ).Success )
         {
            // state was incorrect
            MessageBox.Show( "Invalid State", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            stateTextBox.Focus();

            return;
         }

         // if zip code format invalid show message
         if ( !Regex.Match( zipTextBox.Text, @"^\d{5}$" ).Success )
         {
            // zip was incorrect
            MessageBox.Show( "Invalid Zip Code", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            zipTextBox.Focus();

            return;
         }

         // if phone number format invalid show message
         if ( !Regex.Match( phoneTextBox.Text, 
            @"^[1-9]\d{2}-[1-9]\d{2}-\d{4}$" ).Success )
         {
            // phone number was incorrect
            MessageBox.Show( "Invalid Phone Number", "Message",
               MessageBoxButtons.OK, MessageBoxIcon.Error );
            phoneTextBox.Focus();

            return;
         }

         // information is valid, signal user and exit application
         this.Hide();
         MessageBox.Show( "Thank You!", "Information Correct",
            MessageBoxButtons.OK, MessageBoxIcon.Information );

         Application.Exit();

      } // end method OkButton_Click

   } // end class validateForm
}

/*
 **************************************************************************
 * (C) Copyright 2002 by Deitel & Associates, Inc. and Prentice Hall.     *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 **************************************************************************
*/