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Exception calling "ExecuteReader" with "0" argument(s): "Invalid column name 'Code'.
Invalid column name 'Name'.
Invalid column name 'Phone'.
Invalid column name 'RoleId'."
At D:\Media\uz1.ps1:9 char:1
+ $rd=$cmd.ExecuteReader()
+ ~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SqlException
 
You cannot call a method on a null-valued expression.
At D:\Media\uz1.ps1:10 char:7
+ while($rd.Read()){$row="";for($i=0;$i -lt $rd.FieldCount;$i++){if($i  ...
+       ~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull
 
You cannot call a method on a null-valued expression.
At D:\Media\uz1.ps1:11 char:1
+ $rd.Close()
+ ~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull