string-int-string generates exception with ConvertTo...

[js]

Hello,

I have two text boxes accepting ints and displaying their Sum.

This code works:

string ans;
ans = Convert.ToString(Convert.ToInt32(textBoxX.Text) +
Convert.ToInt32(textBoxY.Text));
labelAnswer.Text = ans;

But this code generates InvalidCastException:

labelAnswer.Text = Convert.ToString( Convert.ToInt32(textBoxX.Text) +

Convert.ToInt32(textBoxY) );

Why? What's the difference?

brad.

[Austin Ehlers]

Below.
On Sun, 5 Oct 2003 00:49:45 +0800, "js" <[e-mail]> wrote:

Hello,

I have two text boxes accepting ints and displaying their Sum.

This code works:

string ans;
ans = Convert.ToString(Convert.ToInt32(textBoxX.Text) +
Convert.ToInt32(textBoxY.Text));
labelAnswer.Text = ans;

But this code generates InvalidCastException:

labelAnswer.Text = Convert.ToString( Convert.ToInt32(textBoxX.Text) +

Convert.ToInt32(textBoxY) );

Assuming this is your actual code, you're asking the Convert class to
convert textBoxY to an Int32. Specify the string, textBoxY.Text, and
you'll be fine.

Austin Ehlers

[Austin Ehlers]

Below.
On Sun, 5 Oct 2003 00:49:45 +0800, "js" <[e-mail]> wrote:

Hello,

I have two text boxes accepting ints and displaying their Sum.

This code works:

string ans;
ans = Convert.ToString(Convert.ToInt32(textBoxX.Text) +
Convert.ToInt32(textBoxY.Text));
labelAnswer.Text = ans;

But this code generates InvalidCastException:

labelAnswer.Text = Convert.ToString( Convert.ToInt32(textBoxX.Text) +

Convert.ToInt32(textBoxY) );

Assuming this is your actual code, you're asking the Convert class to
convert textBoxY to an Int32. Specify the string, textBoxY.Text, and
you'll be fine.

Austin Ehlers