I am new to c#, this may be very easy question.

In my application there is a `Form` in which I have datagridview `dgvBill` and a Button `btnClick`. I declared columns to it by clicking the extender and selecting `add columns`. After executing the form, I written some text to each column in `dgvBill`. When I click on `btnClick` it is creating an xml file but with no data in it. (why the data is not being added ?)

The created XML file looks like this:

```
<?xml version="1.0" standalone="yes"?>
<NewDataSet />

```

I have tried the below code:

**btnClick Event**

```
DataSet ds = new DataSet();
ds.WriteXml(@"..\..\Customer_Info\" + lblCustId.Text + ".xml");
dgvBill.DataSource = ds;  /* also tried ds.Tables[0] */

```

`lblCustId` is a label in the `Form`

*Optional*: can I make each cell of datagridview into ComboBox?

Thanks in advance.