InfoPath Dev

Hi. I am trying to save data in a sql database using InforPath 2007 with my own code in Visual studio tools fro applications. I do not know how to connect the field i have on the template (form) with the code. For example in Visua Studio C# you write:

variable_string = txtBoxTex.text.

How do i Write the same in  Visual studio tools fro applications, how do i connect the textbox from the template(form) with the value i define in the code? Thank you!

P.S. I am new with InfoPath. 

XPathNavigator xnDoc = null;

xnFormName = xnDoc.SelectSingleNode("Field_Xpath_Path", this.NamespaceManager);

variable_string= xnFormName.Value;

//To get field xpath -> in design task -> Data source -> right click on the field and click Copy XPath

  Thank you so much Qazi Anis. I did the job!

:-bd

 There is one more thing. When I am using

 XPathNavigator(xnFormName = null)

i get this error

Error    1    'XPathNavigator' is a type and cannot be used as an expression.  

I have commented the line and the program works, but why the error?

Thank you!

what are you trying to achieve by

XPathNavigator(xnFormName = null)

i think you should try

xnFormName= Xndoc.SelectSingleNode("XPATH",this.NamespaceManager);

if (xnFormName == null)

{

//your code

}

 Thank you cery much!