c# - Dynamic SQL query causes "Unclosed quotation mark" error -

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I am getting this error:

After the character string, the quotation mark symbol '' .

With the following code: 

  lSQL = "Remove from TBL corrections where courseCode = '" + aCourseCode + "' ';  < / Pre> 
 where  lSQL  is a local variable and  aCourseCode  is a store value. Any suggestions?   
 
 
 You should use  always  queries, or your code is sensitive to errors worse than SQL injection attacks. When building questions Use the  never  string constant in the form this is the correct way:  
  (var conn = new SqlConnection (ConnectionString)) by using (var cmd = conn. CreateCommand ()) {conn.Open (); Cmd.CommandText = "Remove from TBL corse where course code = @ course seed"; Cmd.Parameters.AddWithValue ("@ courseCode", aCourseCode); Int Removed RowsCount = cmd ExecuteNonQuery ();}   
 will ensure that even if there are some escape and dangerous characters in the  aCourseCode  variable, they will be properly controlled.

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