C#

private void okButton_Click(object sender,EventArgs e) {
  if(textField1.Text != "") {
    DialogResult = DialogResult.OK;
  }
}

int noOfIdNodes = theNode.SelectNodes("papers/id").Count

try
{
// Do stuff...
}
catch (SqlException ex)
{
// you can get the error number from the ErrorCode property:
int errorCode = ex.ErrorCode;
}

1. I think you will have to reload the Xml file into something like the System.Xml.XmlDocument class and then perform the changes from there, resaving the changes
2. Try using number = int.Parse(number.Text);

mrkeivan wrote:

public method

mrkeivan wrote:

how can I declare a public method for that ?

private Form1 f = new Form1();
public Form1 Form
{
  get
  {
    return this.f;
  }
}

MessageBox.Show(this.Form.number.ToString());

mrkeivan wrote:

OK this code should be in my first form as a property, right ?

private Form1 f = new Form1();
public Form1 Form {
  get {
    return this.f;
  }
}

public class MasterForm : Form {
  private Form1 inputForm = new Form1();

  // This is just an example function, you'd put the code from here
  // into you're event handler / whatever function you use to display
  // the code.
  public void DisplayNumber() {
    MessageBox.Show(this.inputForm.number.ToString());
  }
}