Enable Disable Link in GridView row based on condition using C# and VB.Net in ASP.Net

Hi akhter,

Use Hyperlink instead of AnchorLink. Refer below sample.

HTML

<asp:GridView ID="GVballist" runat="server" AutoGenerateColumns="false" OnRowDataBound="OnRowDataBound">
    <Columns>
        <asp:BoundField DataField="DID" HeaderText="DID" SortExpression="DID" />
        <asp:TemplateField HeaderText="Dispatch No">
            <ItemTemplate>
                <asp:HyperLink ID="lnkUpdate" NavigateUrl='<%#String.Format("BBupdate.aspx?DID={0}", Eval("DID"))%>'
                    runat="server" Text='<%#Eval("DID") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Customer">
            <ItemTemplate>
                <asp:Label ID="CustomerName" runat="server" Text='<%#Bind("CustomerName")%>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Date">
            <ItemTemplate>
                <asp:Label ID="Date" runat="server" Text='<%#Bind("Date")%>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Status">
            <ItemTemplate>
                <asp:Label ID="Status" runat="server" Text='<%#Bind("Status")%>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] { 
                        new DataColumn("DID", typeof(int)),
                        new DataColumn("CustomerName", typeof(string)),
                        new DataColumn("Date",typeof(string)),
                        new DataColumn("Status",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "01/01/2019", "Close");
        dt.Rows.Add(2, "Mudassar Khan", "01/01/2019", "Active");
        dt.Rows.Add(3, "Suzanne Mathews", "01/01/2019", "Active");
        dt.Rows.Add(4, "Robert Schidner", "01/01/2019", "Close");
        GVballist.DataSource = dt;
        GVballist.DataBind();
    }
}
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if ((e.Row.FindControl("Status") as Label).Text.ToLower().Trim() == "close")
        {
            (e.Row.FindControl("lnkUpdate") as HyperLink).Enabled = false;
        }
        else
        {
            (e.Row.FindControl("lnkUpdate") as HyperLink).Enabled = 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("DID", GetType(Integer)),
                                              New DataColumn("CustomerName", GetType(String)),
                                              New DataColumn("Date", GetType(String)),
                                              New DataColumn("Status", GetType(String))})
        dt.Rows.Add(1, "John Hammond", "01/01/2019", "Close")
        dt.Rows.Add(2, "Mudassar Khan", "01/01/2019", "Active")
        dt.Rows.Add(3, "Suzanne Mathews", "01/01/2019", "Active")
        dt.Rows.Add(4, "Robert Schidner", "01/01/2019", "Close")
        GVballist.DataSource = dt
        GVballist.DataBind()
    End If
End Sub

Protected Sub OnRowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        If (TryCast(e.Row.FindControl("Status"), Label)).Text.ToLower().Trim() = "close" Then
            TryCast(e.Row.FindControl("lnkUpdate"), HyperLink).Enabled = False
        Else
            TryCast(e.Row.FindControl("lnkUpdate"), HyperLink).Enabled = True
        End If
    End If
End Sub