How to delete multiple checked items in a ListView?

Question

1.00/5 (1 vote)

See more:

C#

protected void btndelete_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();

    for (int i = 0; i < listview1.Items.Count; i++)
    {
        ListViewDataItem items = listview1.Items[i];
        CheckBox chkBox = (CheckBox)items.FindControl("chkdel");

        if (chkBox.Checked == true)
        {
            if (Session["CurrentTable"] != null)
            {
                dt = (DataTable)Session["CurrentTable"];
                dt.Rows.RemoveAt(i);
            }
        }
        else
        {
        }
    }

    Session["CurrentTable"] = dt;
    listview1.DataSource = dt;
    listview1.DataBind();
    BindDataToGridviewDropdownlist();     
}

Here it is deleting one row only. How to delete multiple checked items in listview?

Posted 24-Sep-13 0:20am

karthik mushyam

Updated 24-Sep-13 0:33am

Thanks7872

v2

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Comments

VICK 24-Sep-13 6:23am

rather than using the for loop ,, i think you should use foreach loop.. which will get the checked values and will do what you want.

Or you can use javascript for that..

VICK 24-Sep-13 6:28am

What type of improvement you required???

Piece of code???

VICK 24-Sep-13 6:41am

Have u tried placing debugger over the code and checked that either it is getting different item each time or ???

2 solutions

Solution 2

C#

protected void btndelete_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
var rowsToDelete = new List();
if (Session["CurrentTable"] != null)
{
dt = (DataTable)Session["CurrentTable"];
for (int i = 0; i < listview1.Items.Count; i++)
{
DataRow dr = dt.Rows[i];
ListViewDataItem items = listview1.Items[i];
CheckBox chkBox = (CheckBox)items.FindControl("chkdel");
if (chkBox.Checked == true)
{
rowsToDelete.Add(dr); 
} 
}
rowsToDelete.ForEach(x => dt.Rows.Remove(x));
Session["CurrentTable"] = dt;
listview1.DataSource = dt;
listview1.DataBind();
BindDataToGridviewDropdownlist();
}
}

Posted 24-Sep-13 1:52am

Ajay Kumar Vishwakrama

Updated 24-Sep-13 2:02am

v2

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**Azee** · Accepted Answer · 2013-09-24T00:42:00

Hey there,

Try

C#

dt.AcceptChanges();

after

C#

dt.Rows.RemoveAt(i);

and move

C#

if (Session["CurrentTable"] != null)
{
dt = (DataTable)Session["CurrentTable"];

outside the loop
Also, in this statement,

C#

dt.Rows.RemoveAt(i);

you cannot use i as the index to delete. Introduce another variable e.g. int j = 0 and increment it only when the item is not deleted. This is because whenever you remove a row from DataTable, it will not longer match the data/indexes of listview and you'll get an IndexOutOfBoundsException exception.
Do something like this:

C#

protected void btndelete_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            if (Session["CurrentTable"] != null)
            {
                dt = (DataTable)Session["CurrentTable"];
                int j = 0;
                for (int i = 0; i < listview1.Items.Count; i++)
                {
                    ListViewDataItem items = listview1.Items[i];
                    CheckBox chkBox = (CheckBox)items.FindControl("chkdel");

                    if (chkBox.Checked == true)
                    {
                        dt.Rows.RemoveAt(j);
                        dt.AcceptChanges();
                    }
                    else
                    {
                        j++;
                    }
                }
                Session["CurrentTable"] = dt;
                listview1.DataSource = dt;
                listview1.DataBind();
                BindDataToGridviewDropdownlist();
            }
        }

best of luck