Try this code.
public string RemoveChars(string str)
{
string[] chars = new string[]{",",".","/","!","@","#","$","%","^","&","*","'","\"",";","-","_","(",")",":","|","[","]"};
for(int i = 0; i< chars.Length; i++ )
{
if(str.Contains(chars[i]))
{
str = str.Replace(chars[i],"");
}
}
return str;
}