如何让一个未知的数组知道第几个是空的 比如以上代码

怎么让一个未知的数组知道第几个是空的 比如以下代码

C# code

public DataTable GetOneDataFromTable(string TableName, string[] ElementName,string[] ElementValue)        {            //foreach(String s in ElementName)            StringBuilder sb = new StringBuilder();            sb.Append = "select * from " + TableName + " where ";            sb.Append=""            DataTable dt = Tatest.DBUtility.DbHelperOleDb.GetDataTable(strSql);            return dt;        }