Show Hide Button based on DropDownList selection inside ASP.Net GridView using C# and VB.Net

Hi kankon,

Please refer below sample.

Database

I have made use of the following table Customers with the schema as follows.

I have already inserted few records in the table.

You can download the database table SQL by clicking the download link below.

Download SQL file

HTML

<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
<Columns>
    <asp:BoundField HeaderText="CustomerId" DataField="CustomerId" />
    <asp:BoundField HeaderText="Name" DataField="Name" />
    <asp:TemplateField HeaderText="Country">
        <ItemTemplate>
            <asp:DropDownList ID="ddlCountries" runat="server"
                OnSelectedIndexChanged="OnSelectedIndexChanged"
                SelectedValue='<%# Eval("Country") %>' AutoPostBack="true">
                <asp:ListItem Text="India"></asp:ListItem>
                <asp:ListItem Text="United States"></asp:ListItem>
                <asp:ListItem Text="France"></asp:ListItem>
                <asp:ListItem Text="Russia"></asp:ListItem>
            </asp:DropDownList>
            <br />
            <asp:Button ID="Button100" runat="server" Text=" رسميى+تقرير" Visible="False"></asp:Button>
            <asp:Button ID="Button200" runat="server" Text="رسميى" Visible="False"></asp:Button>
            <asp:Button ID="Button300" runat="server" Text="تقرير" Visible="False"></asp:Button>
        </ItemTemplate>
    </asp:TemplateField>
</Columns>
</asp:GridView>

Namespaces

C#

using System.Configuration;
using System.Data.SqlClient;

VB.Net

Imports System.Configuration
Imports System.Data.SqlClient

Code

C#

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

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    DropDownList ddlCountries = sender as DropDownList;
    GridViewRow row = ddlCountries.NamingContainer as GridViewRow;
    Button button100 = row.FindControl("Button100") as Button;
    Button button200 = row.FindControl("Button200") as Button;
    Button button300 = row.FindControl("Button300") as Button;
    if (ddlCountries.SelectedIndex == 1)
    {
        button100.Visible = true;
    }
    else if (ddlCountries.SelectedIndex == 2)
    {
        button200.Visible = true;
    }
    else if (ddlCountries.SelectedIndex == 3)
    {
        button300.Visible = true;
    }
}

private void BindGridView()
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT CustomerId, Name, Country FROM Customers", con))
        {
            con.Open();
            gvCustomers.DataSource = cmd.ExecuteReader();
            gvCustomers.DataBind();
            con.Close();
        }
    }
}

VB.Net

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

    Protected Sub OnSelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
        Dim ddlCountries As DropDownList = TryCast(sender, DropDownList)
        Dim row As GridViewRow = TryCast(ddlCountries.NamingContainer, GridViewRow)
        Dim button100 As Button = TryCast(row.FindControl("Button100"), Button)
        Dim button200 As Button = TryCast(row.FindControl("Button200"), Button)
        Dim button300 As Button = TryCast(row.FindControl("Button300"), Button)

        If ddlCountries.SelectedIndex = 1 Then
            button100.Visible = True
        ElseIf ddlCountries.SelectedIndex = 2 Then
            button200.Visible = True
        ElseIf ddlCountries.SelectedIndex = 3 Then
            button300.Visible = True
        End If
    End Sub

    Private Sub BindGridView()
        Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As SqlConnection = New SqlConnection(conString)
            Using cmd As SqlCommand = New SqlCommand("SELECT CustomerId, Name, Country FROM Customers", con)
                con.Open()
                gvCustomers.DataSource = cmd.ExecuteReader()
                gvCustomers.DataBind()
                con.Close()
            End Using
        End Using
    End Sub

Screenshot