catching phrases

How would I make a program that:

-On button click Event reads a textBox

-If the textBox contains phrases or disallowed letters, the program will removed them.

Picture of Desired look ====> http://i869.photobucket.com/albums/ab255/michaeloohra/untitled-12.jpg




CODE:

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#pragma once
#include <Windows.h>
#include "Form1.h"
#include <iostream>

using namespace std;

namespace AutoDetect {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Summary for Form1
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Button^  button1;
	protected: 
	private: System::Windows::Forms::Button^  button2;
	private: System::Windows::Forms::TextBox^  textBox1;

	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			System::ComponentModel::ComponentResourceManager^  resources = (gcnew System::ComponentModel::ComponentResourceManager(Form1::typeid));
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->button2 = (gcnew System::Windows::Forms::Button());
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->SuspendLayout();
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(12, 221);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(268, 23);
			this->button1->TabIndex = 0;
			this->button1->Text = L"Close";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// button2
			// 
			this->button2->Location = System::Drawing::Point(12, 192);
			this->button2->Name = L"button2";
			this->button2->Size = System::Drawing::Size(268, 23);
			this->button2->TabIndex = 1;
			this->button2->Text = L"Detect";
			this->button2->UseVisualStyleBackColor = true;
			this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(12, 13);
			this->textBox1->Multiline = true;
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(268, 173);
			this->textBox1->TabIndex = 2;
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(292, 259);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->button2);
			this->Controls->Add(this->button1);
			this->Icon = (cli::safe_cast<System::Drawing::Icon^  >(resources->GetObject(L"$this.Icon")));
			this->Name = L"Form1";
			this->Text = L"New Guy!";
			this->TopMost = true;
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) 
			 {
				 //Close Button
				 this->Close();
			 }
	private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) 
			 {

				 //Cplusplus.com
				 // I don't know what to put here..

				 //----------------------------------------------------------------
				 /*if (textBox1->Text *contains* "newguy")
						{
						textBox1->Text = "Sorry, disallowed text present";
						}

				*/
				 //-----------------------------------------------------------------
				
			 }
	};
}

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