How to use a Datalist 'footer template' button in code behind..no one to give a solution to find control inside footer template of datalist

Question

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My datalist is DataList1. I have a footer template to show a button 'BtnCheckOut'.
I get an error like 'Object reference not set to an instance of an object.' on my code at line Button dd1 = (Button)DataList1.Items[index].FindControl("BtnCheckOut");
dd1.Enabled = true;

C#

public void dl_item_command(Object sender, DataListCommandEventArgs e)
    {
        if (e.CommandName == "myevent") // check commandname here
        {
        //BtnCheckOut.Enabled = true;
            int index = e.Item.ItemIndex;
            Button dd1 = (Button)DataList1.Items[index].FindControl("BtnCheckOut");
            dd1.Enabled = true;

XML

<FooterTemplate>
        <asp:Button ID="BtnCheckOut"  runat = "server" Text='Checkout'   Enabled="false"
           Width="100px"  onclick="CheckOutBtn_Click"
           style="z-index: 1; width:80px;cursor:pointer;  font-family:Arial;  text-align:center; height:22px;  font-weight:600; " >
           </asp:Button>
           </FooterTemplate>

Posted 29-Nov-13 22:31pm

S.Rajendran from Coimbatore

Updated 30-Nov-13 3:15am

v3

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Comments

Richard MacCutchan 30-Nov-13 4:56am

The message means some part of that statement failed to return a valid object. Quite possibly the index variable is not valid.

S.Rajendran from Coimbatore 30-Nov-13 6:01am

I tried like this. No use.
public void dl_item_command(Object sender, DataListCommandEventArgs e)
{
if (e.CommandName == "myevent") // check commandname here
{
foreach (DataListItem item in DataList1.Items)
{
if (item.ItemType == ListItemType.Footer)
{
Button dd1 = (Button)item.FindControl("BtnCheckOut");

}
}

S.Rajendran from Coimbatore 30-Nov-13 6:34am

The Button on PageLoad is set to 'false'. When the user selects a row in the datalist , I want to make the button(inside footer) as 'enabled=true'. Thats all.

JoCodes 30-Nov-13 9:54am

Are you getting error in ddl.Enabled = true or the above line?

S.Rajendran from Coimbatore 30-Nov-13 10:21am

Yes

JoCodes 30-Nov-13 10:42am

So the findcontrol was not successful it seems...

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C For Code!!! · Accepted Answer · 2013-11-30T20:32:00

Hello SRajendran,
I had to dig till now the most from the solution of this question so if you got it works for you don't forget to mark it as answer and to upvote also.
Now below is solution

C#

if (e.CommandName == "HitMyCommand")
           {
                  Button btn= (Button)DataList1.Controls[DataList1.Controls.Count - 1].FindControl("Button1");
                  btn.Enabled = true;

           }

Here Trick is in DataList1.Controls.Count . As we know Footer will be the last in Controls index and header will always be first.

Hope This Works For YOu Also!!!