Textbox value to int

You could use a nullable int rather than an ordinary int variable to store the phone number.

If the phone number is blank or invalid, you could then set this variable to null:

string t = textBox1.Text.Trim();
int? phoneNumber = null;

if (t != "")
{
   int temp;
   if(int.TryParse(t, out temp)) phoneNumber = temp;
}

You have to do always like this.

            int i;
            bool result = int.TryParse(textBox1.Text, out i);
            if (result)
            {
                i = Convert.ToInt32(textBox1.Text);
            }


Because the value can be null or string or alphanumric.

If it is useful then mark it as accepted answer.

Hi Vijay,




private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("Insert Phone no");
            }
            else
            {
                label1.Text = Convert.ToInt32(textBox1.Text).ToString();
            }
        }



Thanks