private void btnCalcValueAt_Click(object sender, EventArgs e) { try { Explicit2DFunction explicitFunction = null; explicitFunction = new Explicit2DFunction(txtExplicitFunction.Text); txtYValuleAt.Text = explicitFunction.ValueAt((double)nudValueAt.Value).ToString(); } catch (Exception ex) { MessageBox.Show(ex.Message, "MathX Demo", MessageBoxButtons.OK, MessageBoxIcon.Error); return; } }