How Can I Access Variables from Different Methods in a C# Form?

Using Variables from Other Methods in C

When working with C#, accessing variables defined in one method from another can be a common challenge, especially for beginners. Let's explore a possible solution to this issue.

Problem:

You have created a form in C# with a text box named "readG" and another named "readQ". You want to read the numbers entered into these text boxes using individual methods ("readG_TextChanged" and "readQ_TextChanged") and then perform an operation with the obtained decimal values in a third method ("button1_Click"). However, the decimal values obtained in the first two methods (_Gd and _Qd) are not accessible within the third method.

Answer:

To resolve this issue, you can declare the _Gd and _Qd variables at the class level instead of within the individual methods. By doing so, these variables will be accessible throughout the class, including within the "button1_Click" method.

Here is an adjusted version of your code:

private decimal _Gd;
private decimal _Qd;

public void readG_TextChanged(object sender, EventArgs e)
{
    string _G = readG.Text;
    _Gd = Convert.ToDecimal(_G);
}

public void readQ_TextChanged(object sender, EventArgs e)
{
    string _Q = readQ.Text;
    _Qd = Convert.ToDecimal(_Q);
}

private void button1_Click(object sender, EventArgs e)
{
    decimal _ULS = (1.35m * _Gd + 1.5m * _Qd);
    Console.WriteLine("{0}",_ULS);
}

By declaring _Gd and _Qd at the class level, you ensure that they are available for use in the "button1_Click" method, allowing you to successfully perform the desired operation.

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