Take parameter from listview - asp.net

Question

i have this code:
protected void Button1_Click(object sender, EventArgs e)
{
System.Data.SqlClient.SqlConnection sc = new System.Data.SqlClient.SqlConnection(GetConnectionString());
{
System.Data.SqlClient.SqlCommand cmd;
sc.Open();
cmd = new System.Data.SqlClient.SqlCommand("SET IDENTITY_INSERT Zapas OFF INSERT INTO Zapas (Zapas.Sezona,.....)SELECT Zapas.Sezona,... FROM Zapas WHERE ID_zapas=#ID;", sc);
cmd.Parameters.Add(new System.Data.SqlClient.SqlParameter("#ID", System.Data.SqlDbType.Text)).Value = (TextBox)ListView1.FindControl("box1");
cmd.ExecuteNonQuery();
sc.Close();
Response.Redirect("~/Zapasy_seznam.aspx");
}
}
I need take value ID from listview, but with this code I have this error:
...expects the parameter '#ID', which was not supplied....
This part of my listview...
<asp:ListView ID="ListView1" runat="server" DataKeyNames="ID_zapas" DataSourceID="SqlDataSource1" style="text-align: center ">
<AlternatingItemTemplate>
<tr style="background-color: #e9ffe9;color: #284775;text-align:center">
<td>
<asp:TextBox ID="box1" runat="server" Text='<%# Eval("ID_zapas") %>' Visible="false" />
...
<td style="width:50px;background-color:white">
<asp:LinkButton ID="Button1" runat="server" OnClick="Button1_Click" Visible='<%# HttpContext.Current.User.IsInRole("admin") %>' CausesValidation="False" OnClientClick="javascript: return confirm('Opravdu chcete zápas zkopírovat?');">
<asp:Image ID="Image2" runat="server" ImageUrl="~/Icons/copy.png" Width="29px" Height="29px" ToolTip="Zkopírovat zápas" />
</asp:LinkButton>
</td>
</tr>
</AlternatingItemTemplate>
Have you some idea?

Answer 1

As per comments, please try this:
using System.Data.SqlClient;
protected void Button1_Click(object sender, EventArgs e)
{
var box1 = (TextBox)((LinkButton)sender).Parent.FindControl("box1");
using (var sc = new SqlConnection(GetConnectionString()))
{
using (var cmd = sc.CreateCommand())
{
sc.Open();
cmd.CommandText = "SET IDENTITY_INSERT Zapas OFF INSERT INTO Zapas (Zapas.Sezona,.....)SELECT Zapas.Sezona,... FROM Zapas WHERE ID_zapas=#ID;";
cmd.Parameters.AddWithValue("#ID", box1.Text);
cmd.ExecuteNonQuery();
sc.Close();
Response.Redirect("~/Zapasy_seznam.aspx");
}
}
}
When using data-aware controls such as a ListView here, the controls are created with automatic unique IDs per data item. This means that you can have more than 1 of the same control (such as "box1" in this case) within the page that should be referenced by the data item (((LinkButton)sender).Parent which is ListViewDataItem, representing the row).
ListViewDataItem.FindControl will find controls of a specific server ID within its own child scope, allowing you to get values for controls within the same row of the button that is being clicked.