ASP.NET

<asp:CheckBox ID="checkall" runat="server" AutoPostBack="true" Text="(un)check all"
    OnCheckedChanged="checkall_CheckedChanged" />
<asp:CheckBoxList ID="listCheck" runat="server" AutoPostBack="true" OnSelectedIndexChanged="listCheck_SelectedIndexChanged">
    <asp:ListItem Text="Main1"></asp:ListItem>
    <asp:ListItem Text="Main2"></asp:ListItem>
    <asp:ListItem Text="Main3"></asp:ListItem>
    <asp:ListItem Text="Main4"></asp:ListItem>
    <asp:ListItem Text="Main5"></asp:ListItem>
</asp:CheckBoxList>

private bool overrideEvent;
protected void listCheck_SelectedIndexChanged(object sender, EventArgs e)
{
    //we changed something in the list, so if checkall was checked, uncheck it.
    overrideEvent= true;
    checkall.Checked =  false;
}


protected void checkall_CheckedChanged(object sender, EventArgs e)
{
    if (overrideEvent)
        return;

    for (int items = 0; items < listCheck.Items.Count; items++)
        listCheck.Items[items].Selected = checkall.Checked;
}

haripinna wrote:

GridViewRow row = gv.Rows[i];
CheckBox chkbox = (CheckBox)row.FindControl("chkSelect")

for(i=0;i<gv.rows.count;i++)>
{
GridViewRow row = gv.Rows[i];
CheckBox chkbox = (CheckBox)row.FindControl("chkSelect")
if(chkbox.checked)
{
int pID = Convert.ToInt32(gv.DataKeys[row.RowIndex].Value);
}
}</gv.rows.count;i++)>

Index was out of range. Must be non-negative and less than the size of the collection.<br />
Parameter name: index