How to return a query result as a string in C#?

Question

The query below returns a single VARCHAR value and I want to return this value as a string. How would I do that?

Code snippet:

string query = "SELECT " + FieldName + " FROM " + Table4 + " WHERE StartTime=" +
                    StartTime + " AND SystemId=" + SystemId + '"';
string result = "";

MySqlCommand cmd = new MySqlCommand(query, connection);
var reader = cmd.ExecuteReader();
while (reader.Read())
{
        result = ...  // set "result" to the output of the query here
}
return result;
}

Answer 1

You can create a List and add the values to the list. After return the List.

Answer 2

How to return a VARCHAR query result as a string:

while (reader.Read())
{
        results= reader.GetString(0);                          // Added this
}
return results;