Hi Matt,

thanks for your answer. I will have a look at this sample. At the moment I add the rows at the doubleclick-event. But I think your hint with the BeforeRowExpanded event would be better. thanks

Hi Nixa,

Below is the code for binding data to your UltraDataSource grid 

// Populating Columns for the Ultradatasource

for (int i = 0; i < dsAllSamples.Tables[0].Columns.Count; i++)
{
        ultraDataSource1.Band.Columns.Add(dsAllSamples.Tables[0].Columns[i].Caption);
}

//Creating No. of rows as No. records found in the datatable (dsAllSamples.Tables[0]) and then add to UltraDataSource

for (int i = 0; i < dsAllSamples.Tables[0].Rows.Count; i++)
{
       UltraDataRow  dr = ultraDataSource1.Rows.Add(); 

      for (int  j = 0; j < dsAllSamples.Tables[0].Columns.Count; j++)
     {
          dr.SetCellValue(j, Convert.ToString(dsAllSamples.Tables[0].Rows[i][j]));
     }
}

SamplesDataUltraGrid.DisplayLayout.LoadStyle =

LoadStyle.LoadOnDemand;
SamplesDataUltraGrid.DataSource = ultraDataSource1;

I had a look at the 1 million row example the last days, but don't get it until now.

My biggest problem is that the examples always generate the cell-values manually. How can I set the cellvalues or the whole row if I have the data in a normal system.data.datatable? Is it neccessary to convert them and if yes how?

What I have until now (dataGridDT is the dataTable with the parentrows):

Me.UltraDataSource.Band.Key = "RootBand"

' Add table columns to the root band.

For Each c As System.Data.DataColumn In dataGridDT.Columns

Me.UltraDataSource.Band.Columns.Add(c.ColumnName, c.GetType)

Next

If Me.UltraDataSource.Rows.Count = 0 Then

getroot(Me.UltraDataSource, Me.dataGridDT, Me.UltraDataSource.GetBandByKey("RootBand"))

End If

Dim childBand As UltraDataBand = Me.UltraDataSource.Band.ChildBands.Add("ChildBand")

Me.UltraDataSource.Rows.SetCount(Me.dataGridDT.Rows.Count)

Grid.DataSource = Me.UltraDataSource

 

 Private Sub getroot(ByVal DS As UltraDataSource, ByVal table As System.Data.DataTable, ByVal bandname As UltraDataBand)

Dim row As System.Data.DataRow

For Each row In table.Rows DS.Rows.Add(New Object() {row})

Next

End Sub

 The "Add(New Object() {row})" throws an exception, cause it can't convert the system.datarow in a infragistics row. Or have I to loop around every column to add there values ?

Another big milestone is the loading process of my childdata. In virtualmode I have to define columns and set the rowcount before filling the cells. I know my parentcolumns (they are fixed) and the rows of my rootband should be loaded full at Initialize the UltraDataSource. But my childdata and also there columns can change depends on a select in a UltraTree. So I can't define the columns before, as well the rowcount. I want to load this childdata in a dataTable at expand-click event on a parentrow and set this values for the childdata then. is this possible?

I would be glad if anybody have some helping code or hints for me.

thanks a million