Question

I have a gridview on my ASP website that needs to process each row and, based on a condition, either keep the row or remove it and add it to another gridview. I’ve figured out how to remove the row by simply using one of the built-in methods. Everything I find online is telling me to use the “gridview.Rows.Add(row)” property, however it creates the following error in Visual Studio:

“‘Add’ is not a member of ‘System.Web.UI.WebControls.GridViewRowCollection’.”

• grdTraining is the “master” gridview containing the results to be examined.
• grdExpTraining is the “secondary” gridview that takes the rows pulled from the “master.”

• grdTraining_RowDataBound is a method that gets called everytime the website finds records to place into grdTraining.

  Protected Sub grdTraining_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles grdTraining.RowDataBound
  
     ' Grey out expired training courses
     Dim row As GridViewRow
     row = e.Row
     Dim incomingDate As String
     incomingDate = row.Cells(4).Text.ToString()
  
     If (e.Row.RowType <> DataControlRowType.DataRow) Then
         Exit Sub
     End If
  
     Try
         Dim expDate As Date = incomingDate
         If (expDate < DateTime.Today) Then
             grdExpTraining.Rows.Add(row)    'The line that is causing the error
             grdTraining.DeleteRow(trnIndex)
         End If
     Catch ex As Exception
     End Try
  
     trnIndex += 1
  End Sub
  

Answer 1

I was able to add a row to my grid view using the following code. I basically had to re-do the entire process again, treating the nested gridview like a completely new gridview. This also only works if you plan on placing one row in the nested gridview. You can play with the scope of the DataTable and DataRow declarations to do otherwise.

            'Create datatable and columns
            Dim dtable As New DataTable
            dtable.Columns.Add(New DataColumn("StateCode"))
            dtable.Columns.Add(New DataColumn("CourseDesc"))
            dtable.Columns.Add(New DataColumn("Hours"))
            dtable.Columns.Add(New DataColumn("EffectiveDate"))
            dtable.Columns.Add(New DataColumn("ExpirationDate"))
            dtable.Columns.Add(New DataColumn("LastChange"))

            'Create counter to prevent out of bounds exception
            Dim i As Integer = row.Cells.Count

            'Create object for RowValues
            Dim RowValues As Object() = {"", "", "", "", "", ""}

            'Fill row values appropriately
            For index As Integer = 0 To i - 1
                RowValues(index) = row.Cells(index).Text
            Next

            'create new data row
            Dim dRow As DataRow
            dRow = dtable.Rows.Add(RowValues)
            dtable.AcceptChanges()

            'now bind datatable to gridview... 
            grdExpTraining.DataSource = dtable
            grdExpTraining.DataBind()