The drop downs default to 0

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hi
i am populating two drop downs from the values in the first it works fine but when i put the other two drops index to zero the all default to zero

C#

protected void ddlLifeCover_SelectedIndexChanged(object sender, EventArgs e)
        {
            ddlDisabilityCover.Enabled = true;
            ddlDisabilityCover.Items.Clear();
            ddlDreadDiseaseCover.Enabled = true;
            ddlDreadDiseaseCover.Items.Clear();


            int selection = int.Parse(ddlLifeCover.SelectedItem.Value);

            foreach (ListItem lis in ddlLifeCover.Items)
            {
                if (int.Parse(lis.Value) <= selection)
                {
                    ddlDisabilityCover.Items.Add(lis);
                    ddlDreadDiseaseCover.Items.Add(lis);

                }

                ddlDisabilityCover.SelectedIndex = 0;
            }


               }

            }

Posted 30-Aug-12 6:02am

MarkNinja

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Comments

Christian Amado 30-Aug-12 12:04pm

WinForms, ASP.NET? WPF, Silverlight?

Thomas Daniels 30-Aug-12 12:09pm

Is it in ASP.NET, Windows Forms, or WPF?

Dasaradhi_r 30-Aug-12 12:46pm

I guess it is a web application going by the code (It is a drop down list).
But, it is difficult to understand what your problem is?
Give details of data loaded into the dropdown list. That can help in understanding the issue.

3 solutions

Solution 2

when i put the other two drops index to zero the all default to zero
This is because you are dealing with objects here (reference setting and not value setting).

See:

C#

ddlDisabilityCover.Items.Add(lis); 
ddlDreadDiseaseCover.Items.Add(lis);

You found a ddlLifeCover.Item which you add to other items. It's a reference type connection. Thus, in actual you are referring to one list item in all the three leading to reset on setting other.

Posted 30-Aug-12 6:41am

Sandeep Mewara

Solution 3

if it is in ASP.NET then PostBack is happening.

if(!isPostBack)
{
}

is required

Posted 30-Aug-12 6:42am

Sourav Sarkar-SS

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Christian Graus · Accepted Answer · 2012-08-30T06:12:00

Solution 1

Regardless of the framework, changing the items in a drop list, resets the selected index. If you must add or remove items, store the selected index first and reset it when you're done.

Posted 30-Aug-12 6:12am

Christian Graus

Comments

Sandeep Mewara 30-Aug-12 12:42pm

Based on the code, it's object addition and thus reference call makes it reset.