i have a little problem in my code, i tried to match my textbox value to database, bu i get an error message ...
here is my codes:
my main code;
protected void btnAddNewTopic_Click(object sender, EventArgs e)
{
if (txtbAddNewTopic.Text == "")
{
MessageBox.Show("Please write topic!");
}
else if (goodob.Businness_Layer.AddNewTopic.NewTopicCheckSystem(txtbAddNewTopic.Text) == null)
{
MessageBox.Show("Your added topic is already in site!");
}
else
{
goodob.Businness_Layer.CreateNewTopic.crnewtopic(txtbAddNewTopic.Text);
MessageBox.Show("Your topic has successfully created!");
}
}
and my check code ;
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