Dynamic generation of CheckBox in asp.net gridview does not maintain the state

Question

aspx code

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="TestButton" runat="server" OnClick="TestButton_Click"
            Text="AddNewRow" />
    </div>
    <div>
        <asp:GridView ID="MyGrid" runat="server" GridLines="Both"
            AutoGenerateColumns="false" OnDataBound="MyGrid_DataBound"
            EnableViewState="true">
            <Columns>
                <asp:BoundField DataField="Name" HeaderText="name" />
                <asp:TemplateField HeaderText="CheckBox1">
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox1" EnableViewState="true"
                           runat="server" AutoPostBack="true" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="CheckBox2">
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox2" runat="server"
                           EnableViewState="true" AutoPostBack="true" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="CheckBox3">
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox3" runat="server"
                           AutoPostBack="true" EnableViewState="true" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </div>
    </form>
</body>
</html>

Code behind

public DataTable Dt = new DataTable();
protected void Page_Load(object sender, EventArgs e) { }
protected void TestButton_Click(object sender, EventArgs e)
{
   DataRow dr = null;
   if(ViewState["T"]==null)
   {
      Dt.Columns.Add(new DataColumn("Name", typeof(string)));
      Dt.Columns.Add(new DataColumn("CheckBox1", typeof(bool)));
      Dt.Columns.Add(new DataColumn("CheckBox2", typeof(bool)));
      Dt.Columns.Add(new DataColumn("CheckBox3", typeof(bool)));
      ViewState["T"] = Dt;
    }
    Dt =(DataTable) ViewState["T"];
    dr = Dt.NewRow();
    dr["Name"] = "Sam";
    dr["CheckBox1"] = true;
    dr["CheckBox2"] = false;
    dr["CheckBox3"] = false;
    Dt.Rows.Add(dr);
    SearchGrid.DataSource = Dt;
    SearchGrid.DataBind();
 }
 protected void MyGrid_DataBound(object sender, EventArgs e)
 {
    (SearchGrid.Rows[SearchGrid.Rows.Count - 1].Cells[1].FindControl("CheckBox1")
                as CheckBox).Checked = true;
  }
}

when i click the the Addnew row button the result would be some thing like this

enter image description here

but when i click again

enter image description here

the first row check box gets uncheckd. i have enabled the view state for each checkbox but still it does not work. is tehre some thing i should do with the data table which i am binding?

Manish Mishra · Accepted Answer · 2013-09-07 09:33:21Z

1

Your ViewState is perfectly fine. It must be storing the data you want to persist.

You haven't bound your gridView Columns to any field, in this case the DataColumn names of your DataTable. Bind your checkboxes like this:

<asp:CheckBox ID="CheckBoxX" runat="sever" 
           Checked ='<%# Eval("DataFieldName") %>' />

i.e.

<asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Eval("CheckBox1") %>' 
      AutoPostBack="true" EnableViewState="true" />

<asp:CheckBox ID="CheckBox2" runat="server" Checked='<%# Eval("CheckBox2") %>' 
  AutoPostBack="true" EnableViewState="true" />

<asp:CheckBox ID="CheckBox3" runat="server" Checked='<%# Eval("CheckBox3") %>' 
  AutoPostBack="true" EnableViewState="true" />

since CheckBox1, CheckBox2, CheckBox3 are the field(column) names of the DataSource assigned to the SearchGrid(GridView)

edited Sep 7, 2013 at 9:33

answered Sep 7, 2013 at 9:28

Manish Mishra

12.4k5 gold badges40 silver badges65 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Dynamic generation of CheckBox in asp.net gridview does not maintain the state

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related