I am new to c# and trying to search a listbox as following : First i have this :
public partial class FrmCodes : Form
{
...
SqlConnection Cn = new SqlConnection(@"Server = AMR-PC\SQLEXPRESS ; Database=PlanningDB ; Integrated Security = True");
SqlCommand cmd;
SqlDataReader DataRead;
...
public FrmCodes()
{
InitializeComponent();
cmd = new SqlCommand("Select Item from Items", Cn);
Cn.Open();
DataRead = cmd.ExecuteReader();
while (DataRead.Read())
{
ListItems.Items.Add(DataRead["Item"].ToString());
}
DataRead.Close();
Cn.Close();
}
And tried to do this :
private void txtSrch_TextChanged(object sender, EventArgs e)
{
ListItems.Items.Clear();
while (DataRead.Read())
{
string str = DataRead["Item"].ToString();
string srch = txtSrch.Text;
if (str.Contains(srch))
{
ListItems.Items.Add(str);
}
}
}
It did not work , I tried to make a new sql select query that get data depending on txtSrch.Text
but got nothing either .
Thanks in advance.
Edit#1 This is the query i mentioned before :
private void txtSrch_TextChanged(object sender, EventArgs e)
{
ListItems.Items.Clear();
SqlConnection Cn2 = new SqlConnection(@"Server = AMR-PC\SQLEXPRESS ; Database=PlanningDB ; Integrated Security = True");
Cn2.Open();
string srch = txtSrch.Text;
using (SqlDataAdapter a2 = new SqlDataAdapter("Select Item from Items WHERE Item LIKE '%" srch "%'", Cn2))
{
var t2 = new DataTable();
a2.Fill(t2);
ListItems.DisplayMember = "Item";
ListItems.ValueMember = "Code";
ListItems.DataSource = t2;
}
}
This did not affect the items in the listbox nothing happens on txtSrch
Change .
CodePudding user response:
Another solution using Dataview
thanks to @Trevor
public partial class FrmCodes : Form
{
SqlConnection Cn = new SqlConnection(@"Server = AMR-PC\SQLEXPRESS ; Database=PlanningDB ; Integrated Security = True");
SqlDataAdapter da;
DataTable dt = new DataTable();
public FrmCodes()
{
InitializeComponent();
da = new SqlDataAdapter("Select Item from Items", Cn);
da.Fill(dt);
DataView dv = new DataView(dt);
ListItems.DataSource = dv;
ListItems.DisplayMember = "Item";
}
Textbox change :
private void txtSrch_TextChanged(object sender, EventArgs e)
{
ListItems.DataSource = null;
DataView dv = new DataView(dt);
string srch = txtSrch.Text;
dv.RowFilter = string.Format("Item Like '%{0}%'", srch);
ListItems.DataSource = dv;
ListItems.DisplayMember = "Item";
}
Thanks.
CodePudding user response:
Basedon @Olivier Jacot-Descombes’ comments, this worked for me:
private void txtSrch_TextChanged(object sender, EventArgs e)
{
ListItems.DataSource = null;
SqlConnection Cn2 = new SqlConnection(@"Server = AMR-PC\SQLEXPRESS ; Database=PlanningDB ; Integrated Security = True");
Cn2.Open();
string srch = txtSrch.Text;
using (SqlDataAdapter a2 = new SqlDataAdapter("Select Item from Items WHERE Item LIKE '%" srch "%'", Cn2))
{
var t2 = new DataTable();
a2.Fill(t2);
ListItems.DisplayMember = "Item";
ListItems.ValueMember = "Code";
ListItems.DataSource = t2;
}
}