I have the same issue, please, can you tell me how to fix it?
I am doing this:
DataSet1TableAdapters.
GetCategoriesTableAdapter dtaCategories = new DataSet1TableAdapters.GetCategoriesTableAdapter();
dtCategories = dtaCategories.GetData();
gridCategories.DataSource = dtCategories;
gridCategories.DataBind();
then I just press save button, using gridTable.table.Save method and I get the same error
"Specified method is not supported"
thanks,
Fernando