string strText = "江西省宜春市";
Response.Write(strText.Remove(3));
Response.Write("<br>");
Response.Write(strText.Replace("宜春市", "高安市")+"<br>");

String.Remove和String.Replace方法区别_String.Remove和String

String.Remove(4)删除第四个字符后所有内容

String.Replace(cahr1,char2)将char2的值替换char1的值