批量替换字符串

我有这样一个带有html标记的字符串
Go back nearly 30 000 years and you will find out (25)ttt carving painting and molding their visions of the world and (26)ttt into the rocky surfaces of Africa. As a (27)ttt David Colsens has spent years documenting the Art. 
    We (28)ttt that the number of sites in Africa is well over a million you know It’s probably closer to five million. And if you think that each site could have (29)ttt of images you get some idea of the enormous extent of this art you know it is quite (30)ttt. Equally extraordinary experts say is how closly their thoughts and struggles mirror those (31)ttt today. 
    They were trying to express their congnitive system. They were trying to look at the (32)ttt reality. They were looking at issues that were depiction of (33)ttt kinds of thoughts and all this together really reprensents the way they looked at their whole (34)ttt.如何把字符串中的ttt 全部替换成一个文本框<asp:TextBox runat="server"></asp:TextBox>谢谢大家能不吝赐教

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这个，你直接用一个编辑器，查找替换不就完了
如果要程序实现的话，可以把这段当成一段XML来整，替换节点，
也可以用正则找到你所需要的字符串，然后替换。。
string pstr = "(.*?)";
 str = Regex.Replace(str, pstr, "<asp:TextBox runat=\"server\"></asp:TextBox>");
string.Replace("ttt","<asp:TextBox runat=\"server\"> </asp:TextBox>");
strintText = stringText.Replace("ttt ", "<asp:TextBox runat=\"server\"> </asp:TextBox");
试试？吃饭去了，没时间测试，不好意思.
把字符串读出来然后用slipt（替换）这个方法把换成<asp:TextBox runat="server"> 换成</asp:TextBox> 就可以了