Not accepting alias name of sqlserver query table for Join

string Query ="SELECT DISTINCT B.CreatedDate, B.JobTitle,B.Location  FROM UserFeedSelection A  INNER JOIN  JobForm  B ON A.SelectedKeyword = B.Keyword1 OR A.SelectedKeyword = B.Keyword2 OR A.SelectedKeyword = B.Keyword3 OR A.SelectedKeyword = B.Keyword4OR A.SelectedKeyword= B.Keyword5 OR A.SelectedKeyword = B.Keyword6OR A.SelectedKeyword = B.Keyword7"
    
    where cloumns of both tables are like that
    Table -UserFeedSelection--
     User_Id JobFeed Selectedkeyword
    
     Table -JobForm--
    
     [Job_Id] [int] NOT NULL, 
    [Recruiter_id] [int] NULL, 
    [JobTitle] [varchar](100) NULL, 
    [Location] [varchar](50) NULL, 
    [Category] [varchar](50) NULL, 
    [MinExp] [varchar](20) NULL,
    [MaxExp] [varchar](20) NULL, 
    [Body] [varchar](2000) NULL,
    [Keyword1] [varchar](50) NULL,
    [Keyword2] [varchar](50) NULL, 
    [Keyword3] [varchar](50) NULL, 
    [Keyword4] [varchar](50) NULL,
    [Keyword5] [varchar](50) NULL, 
    [Keyword6] [varchar](50) NULL, 
    [Keyword7] [varchar](50) NULL,
    [Investor1] [varchar](50) NULL,
    [Investor2] [varchar](50) NULL, 
    [Investor3] [varchar](50) NULL, 
    [Investor4] [varchar](50) NULL, 
    [Investor5] [varchar](50) NULL,
    [CreatedDate] [datetime] NULL


    da.GetDataReader(Query);
    
    
//nd  GetDataReader() method is in my Dataaccess Layer File
    
public Boolean GetDataReader(string strSql)
        {
            try
            {
                if (connection.State != System.Data.ConnectionState.Open)
                    connection.Open();
    
                SqlCommand sqlCmd = new SqlCommand(strSql, connection);
                sqlCmd.CommandType = CommandType.Text;
    
                if (dataReader != null && dataReader.IsClosed == false)
                    dataReader.Close();
                dataReader = null;
                dataReader = sqlCmd.ExecuteReader();
            }
            catch (Exception ex)
            {
                HandleException.SendMail(ex);
                return false;
            }
            finally
            {
                //  if (connection.State == ConnectionState.Open)
                //       connection.Close();
            }
            return true;
        }