object reference not set.

Replies: 3 | Posted by: Gayathri on 4/8/2010 | Category: ASP.NET Forums | Views: 1373 | Status: [Member]

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protected void chkInTheatres_CheckedChanged1(object sender, EventArgs e)
{
CheckBox cb = (CheckBox)FindControl("chkInTheatres");
if (cb.Checked == true) ---> raises error here "Object reference not set"
{
Response.Write("InTheatres");
}
else
{
Response.End();

}

}

even if i check (if cb != null) simply says it is null for everything.

please help.

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Raja
Posted on: 4/8/2010 10:14:17 PM

Level: Starter | Status: [Member]

Looks like following code is not working

CheckBox cb = (CheckBox)FindControl("chkInTheatres");

I think you should write in following ways

CheckBox cb = (CheckBox)this.Page.FindControl("chkInTheatres");

Have you kept this code into user control or page? if in user control then use this.FindControl if page then this.Page.FindControl if in master page then this.page.Master.FindControl

Regards,
Raja, USA

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Pavanandey
Posted on: 4/9/2010 1:23:43 AM

Level: Bronze | Status: [Member]

the event which ur using is directly refering to the check box so u need not go for findcontrol method u can directly use this

<asp:CheckBox ID="CB1" runat="server" oncheckedchanged="CB1_CheckedChanged" />

protected void CB1_CheckedChanged(object sender, EventArgs e)
{
bool status = CB1.Checked;
}

Thanks
Pavan Kumar
Mark Answer if this fits the need

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Sabarees
Posted on: 4/15/2010 1:19:26 PM

Level: Starter | Status: [Member]

Hi Gayathri,

Use the below code into your CheckedChanged event,

protected void chkInTheatres_CheckedChanged1(object sender, EventArgs e)
{
CheckBox cb = (CheckBox)sender;

if (cb.Checked == true)
{
Response.Write("InTheatres");
}
else
{
Response.End();
}
}

Best Ragards,
Sabarees M

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object reference not set.

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