Question

I am using VS2005. Currently I have a delete linkButton in my gridview, and if I presses on it to delete a row, the GridView goes empty, and I will have to click on the link again to access the page.

Below is my codefor .aspx:

<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" ondatabound="gv_DataBound" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
        <Columns>
                         <asp:TemplateField>
                            <ItemTemplate>

                              <asp:CheckBox ID="UserSelection" OnCheckedChanged="UserSelector_CheckedChanged" runat="server" />
                                 <asp:LinkButton ID="lnkDelete" runat="server" onclick="lnkDelete_Click" Text="Delete" CommandArgument='<%# Eval("Employee") %>' ></asp:LinkButton>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
    </asp:GridView>

Below is my code for .cs

protected void lnkDelete_Click(object sender, EventArgs e)
    {
        LinkButton lnk = (LinkButton)sender;
        string stid = lnk.CommandArgument.ToString();
        SqlDataSource1.SelectCommand = "DELETE FROM [UserDB]where Employee like '%"+stid+"%'";
        SqlDataSource1.DataBind();

    }

I have tried assigning my delete query to SqlDataSource1 and select query to source2, but if that’s the case, my delete query would not work.

I have also tried using IsPostBack on my PageLoad method, but the GridView goes empty as well after clicking on the delete button.

Currently both of my queries are assigned to SqlDataSource1, and once the query is deleted, the page just go blank, although the query is deleted.

May I know how can I refresh the page or reload the GridView table after the delete query is ran?

Thank you.

---

Thanks to the help from you guys, the problem is solved. Currently my working code is as follows:

LinkButton lnk = (LinkButton)sender; 
    string stid = lnk.CommandArgument.ToString();
    SqlConnection conn = new SqlConnection("DATA-SOURCE");
    string sql = string.Format("DELETE FROM [UserDB] where Employee like '%{0}%'",stid);
    SqlCommand cmd = new SqlCommand(sql,conn);
    conn.Open();
    cmd.ExecuteNonQuery();
    conn.Close();
    SqlDataSource1.SelectCommand = "SELECT * FROM [UserDB]";
    SqlDataSource1.DataBind();
    Response.Redirect("/Project/UserList.aspx");

I used a sql connection string for the delete query, and sqldatasource for the select query afterwards, finally refreshed the page by using response.redirect. Hope it helped newbies like me who met this error too.

Great thanks to all who provided help

Answer 1

Try like this

protected void lnkDelete_Click(object sender, EventArgs e)  
{ 
        LinkButton lnk = (LinkButton)sender; 
        string stid = lnk.CommandArgument.ToString(); 
        SqlConnection conn = new SqlConnection(<put your connectionstring here>);
        string sql = string.Format("DELETE FROM [UserDB] where Employee like '%{0}%'",stid);
        SqlCommand cmd = new SqlCommand(sql,conn);
        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();   
        BindTheGridView();

            //or you can use SelectCommand of your SqlDataSource1 and can bind again simply.
} 

EDIT:

public void BindTheGridView()
    {
        SqlConnection conn = new SqlConnection(Connstring);
        string sql = "Select * from [UserDB]";
        SqlCommand cmd = new SqlCommand(sql, conn);
        conn.Open();
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dtb = new DataTable();
        da.Fill(dtb);
        conn.Close();
        SqlDataSource1.DataSource = dtb;
        SqlDataSource1.DataBind();
    }

And you can call this for any time to bind the values.