loop all gridview rows on button click when paging enabled

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C#2.0

C#

ASP.NET

I want to loop through all the rows in foreach. I tried following two ways, but nothing is working.

First Solution GridView1.Rows getting Zero. In this step if i put GridView1.DataBind(), then Gridview is getting Invisible.

Second Solution, looping all the rows and all the pages but the next page checkbox value is also showing the first page last row checkbox value.

GridView1.AllowPaging = false;
GridView1.DataBind();
 
foreach (GridViewRow item in GridView1.Rows)
{
    CheckBox chkBox = (CheckBox)item.FindControl("cbstrChild");
 
    ..............
 
}
 
GridView1.AllowPaging = true;
GridView1.DataBind();

==============================

for (int i = 0; i <gridview1.pagecount;>{
    GridView1.PageIndex = i;
    foreach (GridViewRow item in GridView1.Rows)
    {
        CheckBox chkBox = (CheckBox)item.FindControl("chkBxSelect");

        if (chkBox.Checked)
        {
           ...
        }
    }
}