Convert nvarchar t

If this is just to get a unique index I would highly encourage you to use a system sequence, there is no sorting or ordering and it’s a single index scan in a single table

Here’s a walk through on doing that

// Bring in Ice.Lib.NextValue.dll
const string sequenceName = "InvcGrpIDAA";
var nextVal = new Ice.Lib.NextValue(Db);    
    
int nextGroupID = nextVal.GetNextSequence(sequenceName);
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