Assign Image URL in ASP.Net GridView based on column value in C# and VB.Net

Hi Sanxion,

Instead of using BoundField to check the value and make it hidden you can use of HiddenField and based on the HiddenField do the same checking.

Refer below example.

HTML

<asp:GridView ID="gvBatches" runat="server" AutoGenerateColumns="False" DataKeyNames="BatchID"
    GridLines="Both" OnRowDataBound="gvBatches_RowDataBound">
    <Columns>
        <asp:TemplateField HeaderText="Actual" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:HiddenField ID="hfIsActual" runat="server" Value='<%# Eval("IsActual") %>' />
                <asp:Image ID="ImageActual" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        System.Data.DataTable dt = new System.Data.DataTable();
        dt.Columns.AddRange(new System.Data.DataColumn[] { 
            new System.Data.DataColumn("BatchID", typeof(int)), 
            new System.Data.DataColumn("IsActual", typeof(string)) });
        dt.Rows.Add(1, "False");
        dt.Rows.Add(2, "True");
        dt.Rows.Add(3, "True");
        dt.Rows.Add(4, "False");
        gvBatches.DataSource = dt;
        gvBatches.DataBind();
    }
}

protected void gvBatches_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Image img = (e.Row.Cells[0].FindControl("ImageActual") as Image);
        string isActual = (e.Row.Cells[0].FindControl("hfIsActual") as HiddenField).Value;
        if (isActual.ToLower() == "false")
        {
            img.ImageUrl = "~/Images/minus.png";
        }
        else
        {
            img.ImageUrl = "~/Images/plus.png";

        }
    }
}

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 System.Data.DataTable = New System.Data.DataTable()
        dt.Columns.AddRange(New System.Data.DataColumn() {
                            New System.Data.DataColumn("BatchID", GetType(Integer)),
                            New System.Data.DataColumn("IsActual", GetType(String))})
        dt.Rows.Add(1, "False")
        dt.Rows.Add(2, "True")
        dt.Rows.Add(3, "True")
        dt.Rows.Add(4, "False")
        gvBatches.DataSource = dt
        gvBatches.DataBind()
    End If
End Sub

Protected Sub gvBatches_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim img As Image = (TryCast(e.Row.Cells(0).FindControl("ImageActual"), Image))
        Dim isActual As String = (TryCast(e.Row.Cells(0).FindControl("hfIsActual"), HiddenField)).Value

        If isActual.ToLower() = "false" Then
            img.ImageUrl = "~/Images/minus.png"
        Else
            img.ImageUrl = "~/Images/plus.png"
        End If
    End If
End Sub

Screenshot