ItemDataBound in Datagrid

Question

4.00/5 (1 vote)

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I have a datagrid which is bound to a dataset which itself gets filled via xml.

Now because the Dataset get filled via Xml nodes which contain no data/null are excluded completely(correct me if i'm wrong). I am however needing to know whether the data is null so that i may react in a particular way on the front end(grid).

So the solution i am attempting is by using the Datagrid ItemDataBound event. Wherein i am trying to determine if the column exists and then if not react accordingly by adding a column with the data i desire.

<pre lang="xml">Protected Sub grdDirectivesCancelling_ItemDataBound(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles grdDirectivesCancelling.ItemDataBound


          Dim DRV As DataRowView = CType(e.Item.DataItem, DataRowView)

        Try
            If DRV.Row.Table.Columns.Contains("MyCustomColumn") Then
                Response.Write("<br>data in column value")
            Else
                'add data column
                DRV.Row.Table.Columns.Add("MyCustomColumn")
                'Response.Write("<br>no column value for MyCustomColumn")
            End If
        Catch ex As Exception
            Response.Write(ex)
        End Try



    End Sub

I however receive the following error:

System.NullReferenceException: Object reference not set to an instance of an object. being thrown by

MIDL

If DRV.Row.Table.Columns.Contains(&quot;MyCustomColumn&quot;) Then

:-(

Thanks.

Posted 30-May-11 23:08pm

butchzn

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4 solutions

Solution 1

put ur code inside if condition

If e.Item.DataItem Then

VB

Dim DRV As DataRowView = CType(e.Item.DataItem, DataRowView)

        Try
            If DRV.Row.Table.Columns.Contains("MyCustomColumn") Then
                Response.Write("<br>data in column value")
            Else
                'add data column
                DRV.Row.Table.Columns.Add("MyCustomColumn")
                'Response.Write("<br>no column value for MyCustomColumn")
            End If
        Catch ex As Exception
            Response.Write(ex)
        End Try

End If

now u try

Posted 30-May-11 23:17pm

amit28august

Updated 31-May-11 8:54am

v2

Solution 2

Hi,

Thank you for your assistance,

I have added as you suggested although i now receive another exception.

System.InvalidCastException: Conversion from type 'DataRowView' to type 'Boolean' is not valid

Any ideas would be appreciated.

Thank you.

Posted 31-May-11 0:27am

butchzn

Solution 3

Hi,

you can use

IsDBNull

Posted 31-May-11 0:41am

prateekfgiet

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butchzn · Accepted Answer · 2011-05-31T01:47:00

Solution 4

Hi,

I managed to get this solved.

VB

If e.Item.ItemType = ListItemType.Item Or _
             e.Item.ItemType = ListItemType.AlternatingItem Then

         ...

End If

Thank you so much for the help guys! Thank you for pointing me in the right direction!

Posted 31-May-11 1:47am

butchzn