Question

I have a gridview with selection enabled, I also added a button under it that is supposed to take the user to another page with a formview waiting to display the selected record’s complete information. How do i pass the ID as a query string and use it in the sqldatasource in the other page?

My gridview has

ID
Name

The formview will show

ID
Name
Description
Uploader
Audience
Category

Answer 1

You could take the value from the selected row and redirect on post back.

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.selectedrow.aspx

  Sub CustomersGridView_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim row As GridViewRow = CustomersGridView.SelectedRow
    Response.redirect(String.Format("detailsPage.aspx?id={0}", row.cells(x).text))
  End Sub

  void CustomersGridView_SelectedIndexChanged(Object sender, EventArgs e)
  {
     GridViewRow row = CustomersGridView.SelectedRow;
     Response.Redirect(String.Format("detailsPage.aspx?id={0}", row.cells[x].text));

  }

Where x is the cell that holds the ID

On the details page assuming a stored procedure:

Dim aSource As New SqlDataSource
 aSource.ConnectionString = {your connection string})
 aSource.ProviderName = "System.Data.SqlClient"
 aSource.SelectCommand = {Your stored procedure name}
 aSource.SelectCommandType = SqlDataSourceCommandType.StoredProcedure
 aSource.SelectParameters.Add(New System.Web.UI.WebControls.Parameter("ID", Data.DbType.String, Request.QueryString(0)))

 SqlDataSource aSource;
 aSource.ConnectionString = {your connection string});
 aSource.ProviderName = "System.Data.SqlClient";
 aSource.SelectCommand = {Your stored procedure name};
 aSource.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;
 aSource.SelectParameters.Add(New System.Web.UI.WebControls.Parameter("ID", Data.DbType.String, Request.QueryString[0]));

EDIT: From seeing your response to another answer:

I am fairly certain that the selected row should be visible to your submit function as well.