vb.net error check

[spen2]

how di I check for square root of negatives in vb.net @ the user input
and display an error message

anyone please

spen2

 

[BadgerByte]

Hey Spen,

Math.Sqrt returns NaN (a special value meaning not a number) if a negative is used..
It can be used like this:-

 Dim NumToSquare As Double
		Dim NumSquared As Double

		NumToSquare = Convert.ToDouble(TextBox1.Text)
		NumSquared = Math.Sqrt(NumToSquare)

		If Double.IsNaN(NumSquared) Then
			MsgBox("The number entered was negative")
		Else
			TextBox2.Text = NumSquared.ToString
		End If

 

[falkon_tech]

couldnt you just check to see if the number is less than equal to zero?