Hello im having a problem with comboBox filtering(cascading). So what i have is :
ComboBox1( that is filled with data from the tblDepartment)
comboBox2 (filed by myself from EDIT ITEMS : 1,2,3,4 for years)
comboBox3 ( shoudl be filtered (depended) from the selection of the comboBox1 and comboBox2.
in comboBox3 i want 2 be listed name_of_course that have the department like comboBox1 and year like comboBox2.
Thanks a lot ,best regards.
Sounds like a LINQ job...
You could try something like
comboBox3.DataSource = from c in courses
where c.department == comboBox1.Text
&& c.year == int.Parse(comboBox2.Text)
select c.name;
Yo can use SelectedItem
property of the ComboBox
to get the selected item.
Try This:
private void button1_Click(object sender, EventArgs e)
{
comboAll.Items.Add(comboCourseName.SelectedItem.ToString()+" "+comboYear.SelectedItem.ToString());
}
SqlConnection conn = new SqlConnection("Data Source=jaci;Initial Catalog=projecttest;Integrated Security=True");
string query = string.Format("SELECT name_of_course FROM course WHERE kathedra='" + comboBox1.Text + "' AND year='" + comboBox2.Text + "'");
SqlCommand cmd = new SqlCommand(query);
DataTable dt = new DataTable();
DataSet ds = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(query, conn);
adapter.Fill(dt);
ds.Tables.Add(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox3.Items.Add(dr[0].ToString());
}
I already fixed the problem, but now I'm facing a new problem, when I change the selected item on the Cathedra, I get the previous items in the comboBox3, so I need to make a statement to clear the items but I don't know where to place it - (comboBox3.items.Clear).
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.