maintaning checkbox checked status while paging in grid view

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C#

ASP.NET

Hello friends please help me.

i have one wizard grid and that has paging. there is check boxes in each row and one. if i check the check boxes and goes to the next page. when i come back to first page the check boxes status remains unchecked. I have tried the following but it not affects anything



protected void gvUser_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gvUser.PageIndex = e.NewPageIndex;

//Loading data to Grid
GetData();

//Code to maintain selected record while paging
if (ViewState["SelectedRows"] != null)
{
List<string> selectedItems = (List<string>)ViewState["SelectedRows"];
foreach (GridViewRow row in gvQuestion.Rows)
{
CheckBox chkUser = (CheckBox)row.FindControl("chkUser");
var result = selectedItems.Find(item => item == chkUser.ToolTip);
if (result != null)
{
CheckBox chk = (CheckBox)row.FindControl("chkUser");
if (chk != null)
{
chk.Checked = true;
}
}
}
}
}

public void GetData()
{
try
{
SqlDSUser.SelectCommand = select * from User;

}
catch (Exception)
{
throw;
}
}



protected void chkUser_OnCheckedChanged(object sender, EventArgs e)
{
CheckBox chkStatus = (CheckBox)sender;
GridViewRow selectedrow = (GridViewRow)chkStatus.NamingContainer;

//Getting selected records from View state
List<string> selectedItems = null;
if (ViewState["SelectedRows"] != null)
{
selectedItems = (List<string>)ViewState["SelectedRows"];
}
else
{
selectedItems = new List<string>();
}




//If checked then adding to list
if (chkStatus.Checked)
{

selectedItems.Add(chkStatus.ToolTip);
}
//if unchecked then remove from list if exist
else
{
var result = selectedItems.Find(item => item == chkStatus.ToolTip);

if (result != null)
{
selectedItems.Remove(chkStatus.ToolTip);
}
}

//Assigning Selected records to ViewState
ViewState["SelectedRows"] = selectedItems;
}