Complier keeps telling me that my parsing from string to int is incorrect

Question

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace Guess_that_Number

{

public partial class Form1 : Form

{

//Data Declarations section

int Begin,End,MissTry,Guess,range,veryHigh, High, closePos,closeNeg, Low, veryLow;

public Form1()

{

InitializeComponent();

}

private void label1_Click(object sender, EventArgs e)

{

}

private void lblGuess_Click(object sender, EventArgs e)

{

}

private void btnGuess_Click(object sender, EventArgs e)

{

//Local Variable

int random;

//Variable initailizations

veryHigh = random +20;

High = random +10;

closePos = random +5;

closeNeg = random -5;

Low = random -10;

veryLow = random -20;

MissTry =1; //Counter for missed tries

 

Random rand = new Random(DateTime.Now.Second);

random = rand.Next(Begin, End);

 

//Loop below is used to catch invalid input

while (Guess < Begin && Guess > End)

{

txtHint.Text = "You've entered " + Guess + " which is outside of the guessing range. Try again!";

txtGuess.Clear(); //Clears the txtGuess text box

}

 

//Loop below is intended to take the user's guess and determine how close

//or far a guess is.

do{

if( Guess == random){

txtHint.Text = Guess + " is the the correct number!";

}

else if(Guess <= veryHigh && Guess > High){

txtHint.Text= "Guess is too high. Guess much lower to win.";

txtGuess.Clear();

MissTry++;

}

else if (Guess <= High && Guess > closePos){

txtHint.Text= "Guess is high. Guess lower to win.";

txtGuess.Clear();

MissTry++;

}

else if(Guess <=closePos && Guess > random){

txtHint.Text="Guess is close. Guess a little lower to win!";

txtGuess.Clear();

MissTry++;

}

else if(Guess >=veryLow && Guess < Low){

txtHint.Text="Guess is too low. Guess much higher to win!";

txtGuess.Clear();

MissTry++;

}

else if(Guess >=Low && Guess < closeNeg){

txtHint.Text="Guess is low. Guess higher to win!";

txtGuess.Clear();

MissTry++;

}

else if (Guess >=closeNeg && Guess < random){

txtHint.Text="Guess is close. Guess a little higher to win!";

txtGuess.Clear();

MissTry++;

}

}while( Guess != random || MissTry < 4);

}

 

private void txtNum1_TextChanged(object sender, EventArgs e)

{

Begin = int.Parse(txtNum1.Text); //Converts input in textbox Num1 to an int

}

private void txtNum2_TextChanged(object sender, EventArgs e)

{

End = int.Parse(txtNum2.Text);

}

private void btnStart_Click(object sender, EventArgs e)

{

txtRange.Text = "Guess a number between " + Begin + " to " + End; //Displays the 'guessing' range to the user

}

private void txtRange_TextChanged(object sender, EventArgs e)

{

}

private void txtGuess_TextChanged(object sender, EventArgs e)

{

Guess = int.Parse(txtGuess.Text);

}

private void txtHint_TextChanged(object sender, EventArgs e)

{

}

}

}

 

Can someone PLEASE tell me why the complier keeps telling me that my " Guess = int.Parse(Guess.Text);", statement  is in the incorrect format.