C# .NET - while exporting data to csv file how to give name of file dynamically

Hai.,  

                  In my windows application foe exporting the data in data grid I want to prompt the user to give the name of the file as his/her wish.But present I implemented code to store the file with unique name and it also produce error also while I export another file to that path i.e., the path is already exists with another process.
I used this code to export the data:

 System.IO.StreamWriter streamWriter = new System.IO.StreamWriter("D:\\outputs.csv");
 string strHeader = dataGridView1.Columns[0].HeaderText;
            for (int i = 1; i < dataGridView1.Columns.Count; i++)
            {
                strHeader += "," + dataGridView1.Columns[i].HeaderText;
            }
            streamWriter.WriteLine(strHeader);
            for (int m = 0; m < dataGridView1.Rows.Count; m++)
            {
                string strRowValue = "";
                strRowValue += dataGridView1.Rows[m].Cells[0].Value;
                for (int n = 1; n < dataGridView1.Columns.Count; n++)
                {
                    strRowValue += "," + dataGridView1.Rows[m].Cells[n].Value;
                }
                streamWriter.WriteLine(strRowValue);
            }
 streamWriter.Close();

the code just save the data with that outputs name for only once.But I want to save different file with different names in different locations.
So,Please provide the solution to store the file with different names.

Thanks In Advance.,

Thank You.,
Vijaya.S

You could use a jQuery popup , to ask the user a name for the file that we wants to download to. You can then pass it on to the server, and the server can then do a response.write using the passed filename. 

A sample script is provided below.  Do not forget to add jQuery references. 

Create a popup with a textbox. 
<div id="filenamePopup" title="Download as?">
  <p>
     <span>Please provide a file name</span>
     <input type="text" id="filename" />
  </p>
</div>

Add the popup code.
$('#filenamePopup').dialog({
     modal: true,
     buttons: {
          'Accept': function() {
                       var filename = $(this).find('#filename').val();
             //store the filename in a hidden variable and then use it.
                       $(this).dialog('close');
                    }
'Cancel': function() {
                       $(this).dialog('close');
                    },
});

Finally, open the popup on a button click. In this example, I am using a button named "ButtonDownloadFile" to open the popup.
$('#ButtonDownloadFile').click( function() {
   $('#filenamePopup').dialog('open');
});

However, in my humble opinion you should not do that. You should just throw the file as a response to the browser, and the user will be shown the Open/Save dialog from the browser. The user should and most probably would choose "save", and then provide a new name for the file. That makes more sense. 

This way, you would not have to deal with the "file already exists" errors for yourself. 

Hope this helped.