Create Table dynamically and bind DropDownList in ASP.Net GridView using C#

Hi georgeacuster...,

Use OnRowDataBound event.

Refer below code.

HTML

<asp:GridView ID="gvProducts" runat="server" DataKeyNames="Id"
    EnableViewState="true" CssClass="mGrid" HorizontalAlign="Center"
    AutoGenerateColumns="false" OnRowDataBound="OnRowDataBound">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="ID" ReadOnly="true" />
        <asp:BoundField DataField="Name" HeaderText="Name" ReadOnly="true" />
        <asp:TemplateField
            HeaderText="DDL"
            ItemStyle-CssClass="ddl_Class_new"
            ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:DropDownList runat="server" ID="ddlEMP">
                </asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Code

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

private DataTable GetData()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("id", typeof(Int32));
    dt.Columns.Add("Name", typeof(string));

    DataRow dtrow = dt.NewRow();

    dtrow["Id"] = 1;
    dtrow["Name"] = "FIG";
    dt.Rows.Add(dtrow);

    dtrow = dt.NewRow();
    dtrow["Id"] = 2;
    dtrow["Name"] = "CDE";
    dt.Rows.Add(dtrow);

    dtrow = dt.NewRow();
    dtrow["Id"] = 3;
    dtrow["Name"] = "ABC";
    dt.Rows.Add(dtrow);

    dtrow = dt.NewRow();
    dtrow["Id"] = 4;
    dtrow["Name"] = "Ram";
    dt.Rows.Add(dtrow);

    return dt;
}

private void BindGrid()
{
    gvProducts.DataSource = GetData();
    gvProducts.DataBind();
}

protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string name = e.Row.Cells[1].Text;
        DropDownList ddlEMP = e.Row.FindControl("ddlEMP") as DropDownList;
        ddlEMP.DataSource = GetData();
        ddlEMP.DataTextField = "NAME";
        ddlEMP.DataValueField = "Id";
        ddlEMP.Items.Insert(0, new ListItem("Select", "0"));
        ddlEMP.DataBind();
        if (ddlEMP.Items.FindByText(name) != null)
        {
            ddlEMP.Items.FindByText(name).Selected = true;
        }
    }
}

Output