This code is working on C# code but I can't run on VB.net.

Question

1.00/5 (2 votes)

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This is the error:

Unable to cast object of type 'System.Web.UI.WebControls.TemplateField' to type 'System.Web.UI.WebControls.BoundField'.System Error.

VB

Protected Sub GriView1_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles GridView1.RowCreated
        For Each cell As TableCell In e.Row.Cells
            If Not String.IsNullOrEmpty(cell.Text) AndAlso (cell.Text <> "") Then
                Dim field As BoundField = CType(CType(cell, DataControlFieldCell).ContainingField, BoundField)
                If (field.DataField = "Name") Then
                    field.ReadOnly = True
                End If
            End If
        Next
    End Sub

Posted 11-Jun-15 5:14am

Member 11759154

Updated 11-Jun-15 5:25am

Leo Chapiro

v3

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Comments

Sergey Alexandrovich Kryukov 11-Jun-15 11:34am

Who told you "this code" would be "working on C#"? Probably it wasn't "this". :-)
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-06-11T05:36:00

Solution 1

Please see my comment to the question. It could not be "this code" it if was "working". You can always automatically translate between C# and VB.NET. Please see my past answer: Code Interpretation, C# to VB.NET[^].

—SA

Posted 11-Jun-15 5:36am

Sergey Alexandrovich Kryukov

Richard Deeming · Answer 2 · 2015-06-11T07:03:00

The error message is quite clear - you have a <asp:TemplateField> in your grid, which is not a <asp:BoundField>, so your attempt to cast it as such will fail.

The equivalent code would also fail in C#.

To make it work in C#, you would use the as operator[^] and test for null. In VB.NET, the TryCast operator[^] performs a similar function:

VB.NET

Protected Sub GriView1_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles GridView1.RowCreated
    For Each cell As TableCell In e.Row.Cells
        ' No need to compare to an empty string as well; 
        ' this has already been taken care of by the "IsNullOrEmpty" call.
        If Not String.IsNullOrEmpty(cell.Text) Then 
            Dim fieldCell As DataControlFieldCell = TryCast(cell, DataControlFieldCell)
            If fieldCell IsNot Nothing Then
                Dim field As BoundField = TryCast(fieldCell.ContainingField, BoundField)
                If field IsNot Nothing AndAlso field.DataField = "Name" Then
                    field.ReadOnly = True
                End If
            End If
        End If
    Next
End Sub