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Web form shows error message even when there is no errors!

Posted By:      Posted Date: October 16, 2010    Points: 0   Category :ASP.Net

Hi there,

I'm new to c# and I seem to be having a problem with an error message. If my textbox is left empty my code will throw a format exception and display the message in a label. If I then add a number to the textbox it runs correctly but the error message remains.

Any idea what am I doing wrong?


protected void btnTemp_Click(object sender, EventArgs e)
            float temperature;

                temperature = float.Parse(txtTemp.Text); 

                if (temperature < 15)
                    lblHotCold.Text = "COLD!";
                    lblHotCold.BackColor = Color.Blue;
                else if (temperature > 15 || temperature == 15)
                    lblHotCold.Text = "HOT!";
                    lblHotCold.BackColor = Color.Red;
            catch (FormatException)
                lblErrorMsg.Text = "Textbox can't be left empty";

Cheers Smile

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