Hide LinkButton inside GridView based on condition using VB.Net and C# in ASP.Net

Hi yogeshc,

I have created sample that full-fill your requirement. Refer the below sample.

HTML

<asp:GridView ID="GridView2" runat="server" CssClass="table table-striped table-hover"
    DataKeyNames="student_Id" AutoGenerateColumns="false" GridLines="None" Width="50%"
    OnRowDataBound="OnRowDataBound">
    <Columns>
        <asp:TemplateField HeaderText="Admission No">
            <ItemTemplate>
                <asp:Label ID="lblExamstudent_Id" runat="server" Text='<%# Eval("student_Id") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Term">
            <ItemTemplate>
                <asp:Label ID="lblTerm" runat="server" Text='<%# Eval("Term") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Amount">
            <ItemTemplate>
                <asp:Label ID="lblexamAmount" runat="server" Text='<%# Eval("Amount") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="IsPaid">
            <ItemTemplate>
                <asp:Label ID="lblexamIsPaid" runat="server" Text='<%# getvalu2(Eval("IsPaid")) %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="date">
            <ItemTemplate>
                <asp:Label ID="lblexamdate" runat="server" Text='<%# Eval("date") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Pay">
            <ItemTemplate>
                <asp:LinkButton ID="lnkBtnEditexam" runat="server" Text="Pay Now" CssClass="btn btn-info"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        bindexamfee()
    End If
End Sub

' Get this from database
Private Sub bindexamfee()
    Dim dt As New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("student_Id", GetType(Integer)), New DataColumn("Term", GetType(Integer)), New DataColumn("Amount", GetType(Integer)), New DataColumn("IsPaid", GetType([Boolean])), New DataColumn("date", GetType(String))})
    dt.Rows.Add(10003, 1, 200, 1, "01/10/2017")
    dt.Rows.Add(10003, 2, 200, 1, "02/10/2017")
    dt.Rows.Add(10003, 3, 200, 0, "")
    GridView2.DataSource = dt
    GridView2.DataBind()
End Sub

Public Function getvalu2(objBit As Object) As String
    If (Convert.ToInt32(objBit) = 1) Then
        Return "Yes"
    Else
        Return "No"
    End If
End Function

Protected Sub OnRowDataBound(sender As Object, e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim isPaid As String = TryCast(e.Row.FindControl("lblexamIsPaid"), Label).Text
        If isPaid.ToUpper() = "YES" Then
            TryCast(e.Row.FindControl("lnkBtnEditexam"), LinkButton).Visible = False
        End If
    End If
End Sub

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        bindexamfee();
    }
}

// Get this from database.
private void bindexamfee()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { 
            new DataColumn("student_Id", typeof(int)),
            new DataColumn("Term", typeof(int)),
            new DataColumn("Amount",typeof(int)),
            new DataColumn("IsPaid",typeof(Boolean)),
            new DataColumn("date",typeof(string))
        });
    dt.Rows.Add(10003, 1, 200, 1, "01/10/2017");
    dt.Rows.Add(10003, 2, 200, 1, "02/10/2017");
    dt.Rows.Add(10003, 3, 200, 0, "");
    GridView2.DataSource = dt;
    GridView2.DataBind();
}

public string getvalu2(object objBit)
{
    if ((Convert.ToInt32(objBit) == 1))
    {
        return "Yes";
    }
    else
    {
        return "No";
    }
}

protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string isPaid = (e.Row.FindControl("lblexamIsPaid") as Label).Text;
        if (isPaid.ToUpper() == "YES")
        {
            (e.Row.FindControl("lnkBtnEditexam") as LinkButton).Visible = false;
        }
    }
}

Screenshot

If you don't want to use rowdatabound then you can do it using IF ELSE Condition with EVAL function in GridView using C# and VB.Net.

VB.Net

<asp:TemplateField HeaderText="Pay">
    <ItemTemplate>
        <asp:LinkButton ID="lnkBtnEditexam" runat="server" Text="Pay Now" Visible='<%# If(getvalu2(Eval("IsPaid")).ToString().ToUpper() = "YES", false, true) %>'
            CssClass="btn btn-info"></asp:LinkButton>
    </ItemTemplate>
</asp:TemplateField>

C#

<asp:TemplateField HeaderText="Pay">
    <ItemTemplate>
        <asp:LinkButton ID="lnkBtnEditexam" runat="server" Text="Pay Now" Visible='<%# getvalu2(Eval("IsPaid")).ToString().ToUpper() == "YES" ? false:true %>'
            CssClass="btn btn-info"></asp:LinkButton>
    </ItemTemplate>
</asp:TemplateField>