Hi ,
Check this
protected void Button1_Click(object sender, EventArgs e)
{
List<string> test = new List<string>();
test.Add(DropDownList1.SelectedValue + " , " + DropDownList2.SelectedValue);
GridView1.DataSource = test;
GridView1.DataBind();
((Label)GridView1.Rows[0].Cells[0].FindControl("Label2")).Text = test[0];
}
<div>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem>January</asp:ListItem>
<asp:ListItem>February</asp:ListItem>
<asp:ListItem>March</asp:ListItem>
<asp:ListItem>April</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem>January</asp:ListItem>
<asp:ListItem>February</asp:ListItem>
<asp:ListItem>march</asp:ListItem>
<asp:ListItem>april</asp:ListItem>
</asp:DropDownList>
</div>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" ></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Best Regards
M.Mitwalli