Here how to convert string to double ..

thank u ....
it is working......

Here the textbox2.text value should be stored in table in the format of ''money"...

the string value can't be stored in the table..

There's no need to convert it to a double first. Just do:

label5.Text = textBox2.Text;

Incidentally, to convert what's in the textbox to a double in a fool-proof way. I'd use:

double d;
bool isValid = Double.TryParse(textBox2.Text, out d);

if (!isValid)
{
   MessageBox.Show("Not a valid number. Please amend");
   textBox2.Focus();
   return;
}

// do something with 'd'