Show Hide Label in ASP.Net ListView based on condition using C# and VB.Net

Hi phonghue,

Refer below sample.

HTML

<asp:ListView ID="ListView1" runat="server" OnItemDataBound="ListView1_OnItemDataBound">
    <ItemTemplate>
        <table>
            <tr>
                <td>
                    <p class="padding2">
                        <b>
                            <asp:Label ID="Label39" runat="server" Text="Program Mission:" Font-Size="18px" Font-Names="Arial"
                                Width="180px"></asp:Label></b></p>
                </td>
            </tr>
            <tr>
                <td>
                    <p class="padding4">
                        <asp:Label ID="OPMissionSLabel" runat="server" Text='<%# Eval("Content")%>' Font-Size="12px"
                            Font-Names="Arial" Width="650px"></asp:Label></p>
                </td>
            </tr>
        </table>
    </ItemTemplate>
</asp:ListView>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] { new DataColumn("Content", typeof(string)) });
        dt.Rows.Add();
        dt.Rows.Add("Mudassar Khan");
        dt.Rows.Add("John Hammod");
        dt.Rows.Add();
        ListView1.DataSource = dt;
        ListView1.DataBind();
    }
}

protected void ListView1_OnItemDataBound(object sender, ListViewItemEventArgs e)
{
    Label lblMessage = (e.Item.FindControl("OPMissionSLabel") as Label);
    Label Label39 = (e.Item.FindControl("Label39") as Label);
    if (string.IsNullOrEmpty(lblMessage.Text))
    {
        Label39.Visible = false;
    }
    else
    {
        Label39.Visible = true;
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn() {New DataColumn("Content", GetType(String))})
        dt.Rows.Add()
        dt.Rows.Add("Mudassar Khan")
        dt.Rows.Add("John Hammod")
        dt.Rows.Add()
        ListView1.DataSource = dt
        ListView1.DataBind()
    End If
End Sub

Protected Sub ListView1_OnItemDataBound(ByVal sender As Object, ByVal e As ListViewItemEventArgs)
    Dim lblMessage As Label = (TryCast(e.Item.FindControl("OPMissionSLabel"), Label))
    Dim Label39 As Label = (TryCast(e.Item.FindControl("Label39"), Label))

    If String.IsNullOrEmpty(lblMessage.Text) Then
        Label39.Visible = False
    Else
        Label39.Visible = True
    End If
End Sub

Screenshot