CODEWITHSUNDEEP
c#asp.netc#-4.0gridview
Syed Ali
Syed Ali

Reputation: 279

checkedbox found uncheck on previous page after clicking on next page

when i checked [checked box] data on my page (1) and then go on to next page (2) through paging(bottom button of pages like [1234]) and then checked data on page (2).

when i came back to page (1) then it remain unchecked as i don't checked anything!!!

all the things remains at its original positions. all are unchecked on both pages . when coming from 1 page to page 2 (check-boxes of page 1 forget his value and get unchecked) and after when coming from page 2 to page 1 same thing happens. sorry for my bad and rough English. any suggestion??

Upvotes: 2

Views: 2480

Answers (2)

sajanyamaha
sajanyamaha

Reputation: 3198

If its a gridview or any repeater control try this

Gridview HTML

<asp:GridView ID="GridView1" runat="server" 
AutoGenerateColumns="False" AllowPaging="True"  
PageSize="5" Width="324px" DataKeyNames="CategoryID" 
OnPageIndexChanging="GridView1_PageIndexChanging">
<Columns>
<asp:BoundField DataField="CategoryID" HeaderText="CategoryID" />
<asp:BoundField DataField="CategoryName" HeaderText="CategoryName" />
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

CS Codes

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
  RememberOldValues();
  GridView1.PageIndex = e.NewPageIndex;
  BindData();
  RePopulateValues();
}

And

private void RememberOldValues()
{
  ArrayList categoryIDList = new ArrayList();
  int index = -1;
  foreach (GridViewRow row in GridView1.Rows)
  {
   index = (int) GridView1.DataKeys[row.RowIndex].Value;
   bool result = ((CheckBox)row.FindControl("CheckBox1")).Checked;

  // Check in the Session
  if (Session[CHECKED_ITEMS] != null)
   categoryIDList = (ArrayList)Session[CHECKED_ITEMS];
  if (result)
  {
  if (!categoryIDList.Contains(index))
   categoryIDList.Add(index);
  }
  else
   categoryIDList.Remove(index);
  }
  if (categoryIDList != null && categoryIDList.Count > 0)
   Session[CHECKED_ITEMS] = categoryIDList;
}

And

private void RePopulateValues()
{
  ArrayList categoryIDList = (ArrayList)Session[CHECKED_ITEMS];
  if (categoryIDList != null && categoryIDList.Count > 0)
  {
  foreach (GridViewRow row in GridView1.Rows)
  {
   int index = (int)GridView1.DataKeys[row.RowIndex].Value;
  if (categoryIDList.Contains(index))
  {
   CheckBox myCheckBox = (CheckBox) row.FindControl("CheckBox1");
   myCheckBox.Checked = true;
  }
  }
  }
}

Bind Data Code

EDIT

/* QUERY */
private const string QUERY_SELECT_ALL_CATEGORIES = "SELECT * FROM Categories";

private void BindData()
{
  SqlConnection myConnection = new SqlConnection(ConnectionString);
  SqlDataAdapter ad = new SqlDataAdapter(QUERY_SELECT_ALL_CATEGORIES,
  myConnection);
  DataSet ds = new DataSet();
  ad.Fill(ds, "Categories");
  GridView1.DataSource = ds;
  GridView1.DataBind();
}

For more details chk this Maintaining_State_of_CheckBoxes

Upvotes: 2

Gayatri
Gayatri

Reputation: 274

When you are navigating from one page to another ,your page refreshes so it cant retain value for checkbox,If you want to do this you have to do it from code behind ,write code Checkbox.Checked=True in !IsPostback according to your valid conditions.

Upvotes: 0

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