multiple selection on listbox

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can anyone suggest the code to fetch the record from database according to the multiple selected value from listbox and display it on gridview in c# window application?

Posted 15-Nov-12 19:27pm

Member 8172875

Updated 15-Nov-12 19:57pm

v2

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Mohd. Mukhtar · Answer 1 · 2012-11-15T19:42:00

Solution 1

Hi,

Please write code like below.

C#

string str = "";
foreach(ListItem lstIetm In MyListBox.Items)
{
  If(lstIetm.Selected)
  {
     str+=lstItem.Value.ToString()+",";
  }
}
if(str!="")
{
  str.Remove(str.LastIndexOf(','));
}
//Then write your query with in clause.

Select * from <tableName> where Id in (str)

if you are not able to solve the problem. Please copy here your code snippet.

Posted 15-Nov-12 19:42pm

Mohd. Mukhtar

Updated 15-Nov-12 20:14pm

v3

Comments

Member 8172875 16-Nov-12 2:01am

actually i have no idea about this scenario. i have to select multiple ids from listbox and fetch the data of selected ids from database. display records in gridview.

Mohd. Mukhtar 16-Nov-12 2:15am

please see the above updated answer

Member 8172875 16-Nov-12 2:20am

thanks for the solution.. i will use it and revert you back...thank you so much

Member 8172875 16-Nov-12 2:55am

I got an error "unable to cast object of type 'System.String' to 'System.Web.UI.WebControls.ListItem'"

Member 8172875 16-Nov-12 3:17am

string str = "";
foreach(ListItem lstIetm In MyListBox.Items)// through an exception here "unable to cast object of type 'System.String' to 'System.Web.UI.WebControls.ListItem'"
{
If(lstIetm.Selected)
{
str+=lstItem.Value.ToString()+",";
}
}
if(str!="")
{
str.Remove(str.LastIndexOf(','));
}
//Then write your query with in clause.

Select * from <tableName> where Id in (str)

Member 8172875 · Answer 2 · 2012-11-15T21:14:00

Solution 2

C#

string str = ""; foreach(ListItem lstIetm In MyListBox.Items)// through an exception here "unable to cast object of type 'System.String' to 'System.Web.UI.WebControls.ListItem'" { If(lstIetm.Selected) { str+=lstItem.Value.ToString()+","; } } if(str!="") { str.Remove(str.LastIndexOf(',')); } //Then write your query with in clause. Select * from <tableName> where Id in (str)

Posted 15-Nov-12 21:14pm

Member 8172875

Comments

Mohd. Mukhtar 16-Nov-12 3:46am

MyListBox is your listbox name please verify once again. May be you are getting this error because of incorrect name.

Member 8172875 17-Nov-12 0:39am

if i write the incorrect name. so i will get a compilation error not run time exception. i used correct name. my sample code is
"
string str = "";

foreach(ListItem lstItem in listBox1.Items)
{
if (lstItem.Selected)
{
//str += listBox1.Items.OfType<string>().ToString();
str+=lstItem.Value.ToString()+",";
}
}
if(str!="")
{
str.Remove(str.LastIndexOf(','));
}
"