Question

It seems that I am an idiot, trying to perform a simple query to a SQL database in C#.
This is the query, I am trying to execute:

 _query = "SELECT PC.SN, User.Name + ' ' + User.Family as AssignedTo " +  
          "FROM PC LEFT JOIN Users ON PC.USERID = Users.ID " + 
          "WHERE PC.Type = '" + AssetTypeCB.SelectedItem.ToString() + "'";

The problem is that I am getting a “cannot call methods on nvarchar” error message.
Do you have any idea what might be the issue?

Answer 1

Your query seems wrong. You need to change User.Name to Users.Name, et al. The correct query would be:

 _query = "SELECT PC.SN, Users.Name + ' ' + Users.Family as AssignedTo " +
          "FROM PC LEFT JOIN Users ON PC.USERID = Users.ID " + 
          "WHERE PC.Type = '" + AssetTypeCB.SelectedItem.ToString() + "'";

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Also, allow me to suggest using parameterized queries for your code. This can tell you why you should.