how to reuse variable from function

I have the following code:

static int rnd_nmb()
{
    Random rnda = new Random();
    int skw1 = rnda.Next(1, 11);
    return skw1;
}

private void function1()
{
    rnd_nmb1();
    MessageBox.Show(Convert.ToString(skw1));
}

I want to reuse the variable skw1 to show it on a Message Box, but it says: "the name 'skw1' does not exist in the current context.". I don't know what the problem is. Btw. it's a Windows Forms App and i'm using Visual Studio 2019.

I added the 'return' statement and thought it would work, but it doesn't.