public static SPListItemCollection FindItems(this SPList list, string fieldName, string fieldValue)
{
SPQuery myquery = new SPQuery();
string internalName = string.Empty;
string type = string.Empty;
list.GetColumnProperties(fieldName, out internalName, out type);
myquery.Query = string.Format(@"<Where><Eq><FieldRef Name='{0}' />
<Value Type='{1}'>{2}</Value>
</Eq>
</Where>", internalName, type, fieldValue);
return(list.GetItems(myquery));
}