DBAdapter.Fill(ResultsDataSet)语法错误，请高手指教

[jingsijingyu]

源代码的这样的：
private static string _ConnectionString = "";
static DataAccessHelper()
{
_ConnectionString = ConfigurationManager.ConnectionStrings["MyAdventureWorksConnectionString"].ConnectionString;
}

public static SqlConnection NewConnection
{
get
{
return new SqlConnection(_ConnectionString);
}
}

public static string ConnectionString
{
get { return _ConnectionString; }
}

public static DataSet RunQuery(String QueryString)
{
SqlConnection DBConnection = NewConnection;
SqlDataAdapter DBAdapter;
DataSet ResultsDataSet = new DataSet();

try
{
DBAdapter = new SqlDataAdapter(QueryString, DBConnection);
DBAdapter.Fill(ResultsDataSet);//这一行有错误，显示“这一行附近有语法错误”
DBConnection.Close();
}
catch (Exception ex)
{
if (DBConnection.State == ConnectionState.Open)
{
DBConnection.Close();
}
throw new Exception("从数据库中读取数据时发生错误。", ex);
}

return ResultsDataSet;
}
public static DataSet RunQuery(String QueryString, SqlParameter pa)
{
SqlConnection DBConnection = NewConnection;
SqlCommand DBCommand = new SqlCommand(QueryString, DBConnection);
DBCommand.Parameters.Add(pa);
SqlDataAdapter DBAdapter = new SqlDataAdapter();
DBAdapter.SelectCommand = DBCommand;
DataSet ResultsDataSet = new DataSet();
try
{
DBAdapter.Fill(ResultsDataSet);
DBConnection.Close();

}
catch (Exception ex)
{
if (DBConnection.State == ConnectionState.Open)
{
DBConnection.Close();
}
throw new Exception("从数据库中读取数据时发生错误。", ex);
}
return ResultsDataSet;
}

public static DataSet RunQuery(String QueryString, String TableName)
{
SqlConnection DBConnection = NewConnection;
SqlDataAdapter DBAdapter;
DataSet ResultsDataSet = new DataSet();

try
{
DBAdapter = new SqlDataAdapter(QueryString, DBConnection);
DBAdapter.Fill(ResultsDataSet, TableName);
DBConnection.Close();

}
catch (Exception ex)
{
if (DBConnection.State == ConnectionState.Open)
{
DBConnection.Close();
}
throw new Exception("从数据库中读取数据时发生错误。", ex);
}

return ResultsDataSet;
}

public static void ExecuteNonQuery(string commandstring)
{
SqlConnection sqlConn = NewConnection;

try
{
sqlConn.Open();
SqlCommand cmd = new SqlCommand(commandstring, sqlConn);
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
throw new Exception("执行SQL语句发生错误。", ex);
}
finally
{
if (sqlConn.State == ConnectionState.Open)
{
sqlConn.Close();
}
}

}


DBAdapter.Fill(ResultsDataSet)；显示语法错误和从数据库中读取数据时发生错误。
请高手指教！

[Rock870210]

那是QueryString的问题吧。sql语法有问题

[beyond_me21]

没有给DBConnection指定数据库连接字符串

[lchy110]

你将错误提示贴出来 用异常捕获到错误提示