Set DropDownList selected value on ASP.Net GridView Row selection using C# and VB.Net

Hi SUJAYS,

Please refer below sample.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30" />
        <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
        <asp:BoundField DataField="Country" HeaderText="Country" ItemStyle-Width="150" />
        <asp:CommandField ShowSelectButton="true" />
    </Columns>
</asp:GridView>
<asp:DropDownList runat="server" ID="ddlId">
</asp:DropDownList>
<asp:DropDownList runat="server" ID="ddName">
</asp:DropDownList>
<asp:DropDownList runat="server" ID="ddlCountry">
</asp:DropDownList>

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[3] { new DataColumn("Id", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
        ddlId.DataSource = dt;
        ddlId.DataTextField = "Id";
        ddlId.DataValueField = "Id";
        ddlId.DataBind();

        ddName.DataSource = dt;
        ddName.DataTextField = "Name";
        ddName.DataValueField = "Name";
        ddName.DataBind();

        ddlCountry.DataSource = dt;
        ddlCountry.DataTextField = "Country";
        ddlCountry.DataValueField = "Country";
        ddlCountry.DataBind();
        ListItem select = new ListItem("Select", "0");
        ddlId.Items.Insert(0, select);
        ddName.Items.Insert(0, select);
        ddlCountry.Items.Insert(0, select);
    }
}

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
    GridViewRow row = GridView1.SelectedRow;
    ddlId.ClearSelection();
    ddlId.Items.FindByText(row.Cells[0].Text).Selected = true;
    ddName.ClearSelection();
    ddName.Items.FindByText(row.Cells[1].Text.Trim()).Selected = true;
    ddlCountry.ClearSelection();
    ddlCountry.Items.FindByText(row.Cells[2].Text.Trim()).Selected = 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(2) {New DataColumn("Id", GetType(Integer)), New DataColumn("Name", GetType(String)), New DataColumn("Country", GetType(String))})
        dt.Rows.Add(1, "John Hammond", "United States")
        dt.Rows.Add(2, "Mudassar Khan", "India")
        dt.Rows.Add(3, "Suzanne Mathews", "France")
        dt.Rows.Add(4, "Robert Schidner", "Russia")
        GridView1.DataSource = dt
        GridView1.DataBind()
        ddlId.DataSource = dt
        ddlId.DataTextField = "Id"
        ddlId.DataValueField = "Id"
        ddlId.DataBind()
        ddName.DataSource = dt
        ddName.DataTextField = "Name"
        ddName.DataValueField = "Name"
        ddName.DataBind()
        ddlCountry.DataSource = dt
        ddlCountry.DataTextField = "Country"
        ddlCountry.DataValueField = "Country"
        ddlCountry.DataBind()
        Dim select As ListItem = New ListItem("Select", "0")
        ddlId.Items.Insert(0, select)
        ddName.Items.Insert(0, select)
        ddlCountry.Items.Insert(0, select)
    End If
End Sub

Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim row As GridViewRow = GridView1.SelectedRow
    ddlId.ClearSelection()
    ddlId.Items.FindByText(row.Cells(0).Text).Selected = True
    ddName.ClearSelection()
    ddName.Items.FindByText(row.Cells(1).Text.Trim()).Selected = True
    ddlCountry.ClearSelection()
    ddlCountry.Items.FindByText(row.Cells(2).Text.Trim()).Selected = True
End Sub

Screenshot