Check box selection in asp.net

Hi Suneel161,

Are you shown same value in CheckBox and DropDownlist? Can you rewrite your question briefly?

Thanks,
T.Saravanan

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suppose i have ten checkboxes .
and i have dropdown list . in this i have values say 1 to 5.
when i select value 1 only 1 check box should ckecked any where.
just like book my show seat.
if i select 4 ddl it should check only 4 out of ten checkboxes not more than that

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If the checkboxes are static then check the sample

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

    {

        if (DropDownList1.SelectedItem.Text == "1")

        {

            CheckBox1.Checked = true;

            CheckBox2.Checked = false;

            CheckBox3.Checked = false;

        }

        else if (DropDownList1.SelectedItem.Text == "2")

        {

            CheckBox1.Checked = true;

            CheckBox2.Checked = true;

            CheckBox3.Checked = false;

        }

        else if (DropDownList1.SelectedItem.Text == "3")

        {

            CheckBox1.Checked = true;

            CheckBox2.Checked = true;

            CheckBox3.Checked = true;

        }

    }

Suneel161, if this helps please login to Mark As Answer. | Alert Moderator

Hi Suneel161,

Sorry for the delay....

Try the following code...

In your DropDownList SelectedIndexChanged Event..

if you using CheckBoxList Control means...

Here ddlList --> DropDownList
chkList --> CheckBoxList

int nCount = int.Parse(ddlList.SelectedItem.ToString());

for (int ix = 0; ix < chkList.Items.Count; ix++)

{

  if(ix < nCount)

  {

    chkList.Items[ix].Selected = true;

  }

  else

  {

    chkList.Items[ix].Selected = false;

  }

} 

if you using CheckBox controls in your page means with out any panel (or) other control....

int nCount = int.Parse(ddlList.SelectedItem.ToString());

int nStart = 1;

foreach(Control cnt in Page.Controls)

{

  foreach(Control chcnt in cnt.Controls)

  {

    if(chcnt is CheckBox)

    {

       CheckBox chk =(CheckBox)chcnt;

       chk.Checked = false;

       if(nStart <= nCount)

       {

            chk.Checked = true;

            nStart++;

       } 

    }

  }

}

Try the above coding.. If you struck means ask your doubts i will explain...

Cheers :)

Thanks,
T.Saravanan

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