Syntax error near coalesce

cmd.CommandText = "update dbo.User_Info SET COALESCE(@FirstName, FirstName),COALESCE(@LastName,LastName),COALESCE(@Degree,Degree),COALESCE(@Organization,Organization),COALESCE(@Phone,Phone),COALESCE(@Ext,Ext) where UserName =@username";
            cmd.Parameters.Add("FirstName", SqlDbType.VarChar).Value = TextFirstName.Text;
            cmd.Parameters.Add("LastName", SqlDbType.VarChar).Value = TextLastName.Text;
            cmd.Parameters.Add("Degree", SqlDbType.VarChar).Value = TextDegree.Text;
            cmd.Parameters.Add("Organization", SqlDbType.VarChar).Value = TextOrg.Text;
            cmd.Parameters.Add("Phone", SqlDbType.VarChar).Value = TextPhone.Text;
            cmd.Parameters.Add("Ext", SqlDbType.VarChar).Value = TextExt.Text; 

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