Get ASP.Net GridView row details on DropDownList change using C# and VB.Net

Hi Vincenzo67,

Please refer below sample.

HTML

<form id="form1" runat="server">
    <asp:Label ID="lblDetails" runat="server"></asp:Label>
    <asp:GridView ID="gvCustomers" runat="server" EmptyDataText="No data" EnableViewState="true" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField DataField="Name" HeaderText="Name" />
            <asp:BoundField DataField="Country" HeaderText="Country" />
            <asp:TemplateField HeaderText="ddl1">
                <ItemTemplate>
                    <asp:DropDownList ID="ddl1" runat="server"
                        AutoPostBack="true"
                        OnSelectedIndexChanged="OnSelectedIndexChanged">
                        <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                        <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                        <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
                    </asp:DropDownList>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField
                HeaderText="ddl2">
                <ItemTemplate>
                    <asp:DropDownList ID="ddl2" runat="server"
                        AutoPostBack="true"
                        OnSelectedIndexChanged="OnSelectedIndexChanged">
                        <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                        <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                        <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
                    </asp:DropDownList>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</form>

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[2] { new DataColumn("Name"), new DataColumn("Country") });
        dt.Rows.Add("Robert", "USA");
        dt.Rows.Add("Mudassar", "India");
        gvCustomers.DataSource = dt;
        gvCustomers.DataBind();
    }
}

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    DropDownList ddl = (DropDownList)sender;
    GridViewRow row = (GridViewRow)ddl.NamingContainer;       
    string ddl1 = row.Cells[0].Text;
    string ddl2 = row.Cells[1].Text;
    lblDetails.Text = ddl1 + "<br />" + ddl2;        
}

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(1) {New DataColumn("Name"), New DataColumn("Country")})
        dt.Rows.Add("Robert", "USA")
        dt.Rows.Add("Mudassar", "India")
        gvCustomers.DataSource = dt
        gvCustomers.DataBind()
    End If
End Sub

Protected Sub OnSelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim ddl As DropDownList = CType(sender, DropDownList)
    Dim row As GridViewRow = CType(ddl.NamingContainer, GridViewRow)
    Dim ddl1 As String = row.Cells(0).Text
    Dim ddl2 As String = row.Cells(1).Text
    lblDetails.text = ddl1 & "<br />" & ddl2
End Sub

Screenshot