1- Using the if(datatype.TryParse ( ) methods. To validate user input.

2- Display an error message for celsius TextBox.

I did use "if(datatype.TryParse ( ) methods. To validate user input." but I'm not sure it works fine, but whenever I add "Display an error message for celsius TextBox."

to prevent user of entering "letters" so that the program doesn't crash it gives me errors.

- Temperature Conversion x Enter Temperature Value: Converted Temperature: Convert to Celsius Convert to Fahrenheit Clear Exit ITETET TILE private void celsiusButton_Click(object sender, EventArgs e) { // Declare Variables so the program identify what you are trying to do. double f = Convert.ToDouble(valuetextBox.Text); const double x = 5.00 / 9.00; double c; 20 21 22 23 24 25 26 27 28 29 20 30 31 20 32 2 33 24 2 if (double. TryParse(valuetextBox.Text, out c)) // formula to calculate in celsius. C = ((f - 32) * x); // Disply the value in textb. displayLabel.Text = c.ToString("n2"); { 34 35 else { 36 37 38 39 40 41 42 43 // Display an error message for celsius TextBox. MessageBox.Show("Invalid input for celsius."); { } 44 45 } 46 47 48 49 - private void fahrenheitButton Slick(object sender, EventArgs e) { { //// Declare Variables so the program identify what you are trying to do. double & = Convert.ToDouble(valuetextBox.Text); cons+ daunlov - AA 15 AA. 50 51 100 % 20 1 // Display an error message for celsius TextBox. MessageBox.Show("Invalid input for celsius."); { } } } 38 39 40 4 41 42 43 44 45 46 47 48 49 ra 50 51 private void fahrenheitButton Click(object sender, EventArgs e) { { //// Declare Variables so the program identify what you are trying to do. double c = Convert.ToDouble(valuetextBox.Text); const double x = 9.00 / 5.00; double f; 52 53 54 55 56 57 ra 58 59 60 61 62 63 GA 64 65 66 67 68 if (double. TryParse(valuetextBox.Text, out f)) W formula to calculate in celsius. f = (( * x) + 32); //Disply the value in textb. displayLabel.Text = f.ToString("n2"); } else { // Display an error message for fahrenhe TextBox. MessageBox.Show("Invalid input for fahrenhe."); 11 } } 100 % 20 > 50 51 52 1 reference private void clearButton_Click(object sender, EventArgs e) { // Clear all values. displayLabel.Text = ""; valuetextBox.Text = ""; 54 55 56 57 1 reference private void exitButton_Click(object sender, EventArgs e) { // Exit the program. this.Close(); 58 59 60 61 62 63 64 65 } } 100% No issues found