Check if image exists before binding to datagrid.

Hello I am struggeling with an error when trying to verify a image files existance before binding it to a datagrid.
The error message I am recieving on the if statement is
BC30311: Value of type 'System.Data.DataRowCollection' cannot be converted to 'String'.
I don't see why its trying to convert to a string.
here is the code.

Sub BindGrid()
Dim DS As DataSet
Dim MyCommand As oledbDataAdapter
MyCommand = new oledbDataAdapter("select * from mytable", MyConnection)

DS = new DataSet()
MyCommand.Fill(DS, "mytable")
dim i as integer
for i=0 to DS.Tables("mytable").Rows.Count-1
IF(System.IO.File.Exists(Server.MapPath(DS.Tables("mytable").Rows["picture"])))Then
'picture available
Else
DS.Tables("mytable").Rows["picture"]="images/none.jpg"
end if
Next

MyDataGrid.DataSource=DS.Tables("mytable").DefaultView
MyDataGrid.DataBind()
End Sub

and datagrid image section
<asp:Image id=Image1 runat="server" NAME="Image1" Height = 75 Width =100 ImageUrl='<%# DataBinder.Eval(Container.DataItem, "picture") %>'>

any help is greatly appreciated.
Thanks

 

I collection is an array. you cant put an array in a string. Try to be more specific when referencing the collection.

System.Data.DataRowCollection.Item(ByVal index As Integer) Will get the row at the specified index.