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using System;
using System.Data;
 
public class Test
{
	public DataTable Query(string caseSwitch)
	{
		string table = string.Empty;
		switch(caseSwitch)
		{
			case "ConditionA":
				table = "tableA";
				break;
			case "ConditionB":
				table = "tableB";
				break;
			default:
				table = "tableC";
				break;
		}
		string sql = @"select * from " + table;
 
		// your sql goes here
 
	}
}

prog.cs(2,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing `System.Data' assembly reference?
prog.cs(6,9): error CS0246: The type or namespace name `DataTable' could not be found. Are you missing an assembly reference?
Compilation failed: 2 error(s), 0 warnings

Standard output is empty