One method is as follows;
string vehicletype = value.Tables[0].Rows[0]["VehicleType"].toString()
string strTrimmedString;
int intBracket = vehicletype.IndexOf("(");
if(intBracket > -1)
{
strTrimmedString = vehicletype.Substring(0, intBracket);
}
else
{
strTrimmedString = vehicletype;
}
MSDN Reference on Strings
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