Set(varLookup,
If(IsBlank(LookUp('list_sharepoint', No = Value(DataCardValue39.Text),'Column')),
"f",
LookUp('list_sharepoint', No = Value(DataCardValue39.Text),'Column')));
I want to convert type of varLookup to Text.
Set(varLookup,
If(IsBlank(LookUp('list_sharepoint', No = Value(DataCardValue39.Text),'Column')),
"f",
LookUp('list_sharepoint', No = Value(DataCardValue39.Text),'Column'))));
I did some test according to your description.
You should be missing a parenthesis at the end of your expression and the varLookup will be text type.