Question

In my program i have several texboxes and buttons with coresponding names (ex. TextBox1 – buttonPlus1) like on the picture

but there are filled with numbers loaded from text file.
I want to write function that allows me to press button + and enlarge (add fixed number, for example 100) value from textbox. So far i have done:

  private void buttonPlus1_Click(object sender, EventArgs e)
    {
        AddValue(sender,e);
    }

    private void AddValue(object sender, EventArgs e)
    {
        if (!(sender is Button))
            return;

        string controlName = (sender as Button).Name;
        string textBoxName = controlName.Replace("buttonPlus", "textBox");

        TextBox textBox = this.Controls.Find(textBoxName, false)[0] as TextBox;
        int step = 100;



    }

but i have no idea how to take value (as number) from textBox and add that step. Can somebody please help me? I tried to solve it by myself in many different ways, but it does not work

Answer 1

Get the value:

Convert.ToInt32(textBox.Text)

Save it to a variable, add 100 and just set it as usual.

P.S. You can also use Int32.Parse("")

textBox.Text = Convert.ToInt32(textBox.Text) + 100;

(You might need to .ToString() it)

EDIT:
As ltiong_sh mentioned, you should use TryParse rather then Parse:

int somevalue;
if(Int32.TryParse(textBox.Text, out somevalue))
{
    textBox.Text = somevalue + 100;
}