C# converting String To Integer

The reason may be that in the code

int move = 1;
private void Play_Click(object sender, EventArgs e)
{
    int move = Convert.ToInt32(textBox1.Text);
    timer2.Start();
}

the outer int move statement declares a class level scoped move variable (field), and the int move statement in side the Play_Click method declares a local variable inside the method. Whatever changes made to the move variable inside this method are lost once the execution comes out of this method.

So the value 1 of the class level move variable is only used all the time in the method timer2_Tick_1, hence no change is noticed.

To retain the value assigned to move replace
int move = inside Play_Click method with
move =

Please see the following code to visualize the above in points

void Main()
{
    VarScopeTest varScope = new VarScopeTest();

    varScope.method1(5);
    varScope.method2();
    varScope.method1(10);
    varScope.method2();
}

public class VarScopeTest {
    int move =1;
    int correctMove =1;
    public void method1(int value){
        int move =value;
        correctMove = value;
        Console.WriteLine ("move in side method 1={0}",move);
        Console.WriteLine ("correctMove in side method 1={0}\n",correctMove);
    }
    public void method2(){
        Console.WriteLine ("move in side method 2={0}",move);
        Console.WriteLine ("correctMove in side method 2={0}\n",correctMove);
    }
}

//Output
//move in side method 1=5
//correctMove in side method 1=5
//
//move in side method 2=1
//correctMove in side method 2=5
//
//move in side method 1=10
//correctMove in side method 1=10
//
//move in side method 2=1
//correctMove in side method 2=10

hi
we can user int.Parse method to convert string to int

String to int[^]

int move = 1;
private void Play_Click(object sender, EventArgs e)
     {
int move = (Int)textBox1.Text;
timer2.Start();
}