i can use as following: Collapse | Copy Code double f = Convert.ToDouble(maskedTextBox6.Text); if (f > 102.00) { MessageBox.Show("Err", "", MessageBoxButtons.OK, MessageBoxIcon.Error); } serialPort1.WriteLine(maskedTextBox6.Text);
double f = Convert.ToDouble(maskedTextBox6.Text); if (f > 102.00) { MessageBox.Show("Err", "", MessageBoxButtons.OK, MessageBoxIcon.Error); } serialPort1.WriteLine(maskedTextBox6.Text);
var
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