I am Trying to search In Sqlite Database by LogKac_AImageName as string value through dd but it does not work

// Retrieve the specific log from the database by String.
public LogData_Images ReadLog_String(string dd)
{
    using (var dbConn = new SQLiteConnection(App.DB_PATH))
    {
        var existingconact = dbConn.Query<LogData_Images>("select * FROM LogData_Images WHERE LogKac_AImageName =" + dd).FirstOrDefault();
        return existingconact;
    }
}