updating a row in a datarow / dataset- not working

Hello,

I am trying to update a column in my datarow / dataset but it will not set the value!

 foreach (DataRow dr in ds.Tables["PrintlogFile"].Rows)  //table name
            {
                     dr.BeginEdit();
                     dr.ItemArray[6] = "test";    // edit column
                     dr.EndEdit();
       
            }



Any ideas why the old value sticks and will not update with the new?

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