Question

On entering negative values to a textbox I get an error saying Unhandled Exception: System.OverflowException: Value was either too large or too small for a UInt32.

Here is my code :

 UInt32 n = Convert.ToUInt32(textBox2.Text);    
         if (n > 0)
          //code 
         else
         //code

Answer 1

That happens because UInt32 is unsigned. You should use Int32 (which is unsigned) instead.

So your code should look like:

Int32 n = Convert.ToInt32(textBox2.Text);
if (n > 0)
  //code 
else
  //code

However, I would rather put it like that:

int n;
// TryParse method tries parsing and returns true on successful parsing
if (int.TryParse(textBox2.Text, out n))
{
    if (n > 0)
         // code for positive n
    else
         // code for negative n
}
else
     // handle parsing error