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try this....

C# code:

string str="aaassshhh@gmail.com";
if(str.indexOf("@")!=-1)
{
Response.Write("´æÔÚ@×Ö·û");
}
else
{
....;
}



ÒýÓÃ

@"^([a-z0-9A-Z]+[-|\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\.)+[a-zA-Z]{2,}$";



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C# codestring str="aaassshhh@gmail.com";if(str.indexOf("@")!=-1)
{
    Response.Write("´æÔÚ@×Ö·û");
}else
{
    ....;
}


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