I'm learning how to make and program forms in visual studio and have a very simple task. I need to take a textBox and apply its value to a trackbar in order to manually set it. I made a code that takes the double values of the textbox then sets it to an integer for the trackbar, then takes the value again and converts it to a float value for a dataset not present in the snippets provided. It all works, but I was told that I need to remove the global variables. One of the methods to make this work without the global variables is to "update the method to take a string argument and return an integer." But I'm not sure how I can get this to work without the global variables.

Also, keep in mind, this is just a snippet of the entire code, as I'm only including what is relevant, which is why there is a line involving trackBar1, but no private void for said trackBar.

private string converterString;

private int doubIntConvert;

private float set;

private void doubleToInteger()

{

try

{

double converter = double.Parse(converterString);

{

if (converter >= 1)

{

converter = 1;

}

if (converter <= 0)

{

converter = 0;

}

if (converter >= 0 || converter <= 1)

{

doubIntConvert = Convert.ToInt32(converter * 100);

set = (doubIntConvert / 100f);

}

}

}

catch (Exception ex)

{

LogError("Exception caught during string input: " + ex.Message);

}

}

private void textBox1_TextChanged(object sender, EventArgs e)

{

converterString = textBox1.Text;

doubleToInteger();

trackBar1.Value = doubIntConvert;

outsideData.something.yaddaYadda = set;

}