how to get grid view selected row's DataBase id - asp.net

Question

I have GridView, which is not auto generating columns. In GridView there are 3 columns: one for Checkbox(to delete selected row from DataTable),
one for edit link button(to edit current row),
and the third one is for showing data from DataTable.
I am binding it from DataTable.
I have a primary key in DataTable.
Now my problem is when I am clicking on edit link button I am not getting primary key(id) from
datatable for selected row in grid view (i think row is not selected when i am clicking on edit link button). I cant take row index to match it with datatable primary key as data bound in GridView is filtered.
What I have tried is, I created one more column in grid view as hidden which is primary key column from DataTable. But for that too I am not getting data in hidden column of row which is clicked for edit.
Someone please help with a new idea, or solution for what i am trying.. thanx in advance.

Answer 1

Plese try as follow.. for update, selected ID can be got in gv_RowCommand event. For delection [multiple select checbox] check in btnDelete_Click, enter code here
--------------aspx code--------------------------------
<asp:Button ID="btnDelete" runat="server" Text="Delete"
onclick="btnDelete_Click" />
<asp:GridView ID="gv" runat="server" AutoGenerateColumns="False"
DataKeyNames="ID" onrowcommand="gv_RowCommand"
onrowupdating="gv_RowUpdating">
<Columns>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:CheckBox ID="chkSel" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Update">
<ItemTemplate>
<asp:LinkButton runat="server" CommandArgument='<%# Eval("ID") %>' CommandName="Update" text="Update" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="NAME" HeaderText="Name" />
</Columns>
</asp:GridView>
---------------code behind---------------------------
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
BindData();
}
private void BindData()
{
DataTable dt = new DataTable();
dt.Columns.Add("ID");
dt.Columns.Add("NAME");
DataRow dr = dt.NewRow();
dr[0] = "1";
dr[1] = "James";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr[0] = "2";
dr[1] = "Paul";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr[0] = "3";
dr[1] = "Mary";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr[0] = "4";
dr[1] = "Susan";
dt.Rows.Add(dr);
gv.DataSource = dt;
gv.DataBind();
}
protected void gv_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Update")
{
string id = e.CommandArgument.ToString();
}
}
protected void gv_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
}
protected void btnDelete_Click(object sender, EventArgs e)
{
string idList = "";
for (int i = 0; i < gv.Rows.Count; i++)
{
CheckBox chk = (CheckBox)gv.Rows[i].FindControl("chkSel");
if (chk != null && chk.Checked)
idList += gv.DataKeys[i].Value.ToString() + ",";
}
}