Retrive binary image from Database and assign to Div backround using C# and VB.Net in ASP.Net

Refer the below code if you are getting Byte datafrom database then you need to handel it in ItemDataBound refer the below code for your reference.

HTML

    <div>
    <asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound" >
        <ItemTemplate>
            <asp:HiddenField ID="hfData" runat="server" /> 
            <div class="item" id="DvItem" runat="server">
                <div class="container-fluid">
                    <div>
                        <div class="slider-header fadeInDown-1">
                            Top Brands</div>
                        <div class="big-text fadeInDown-1">
                            Pathanjali's Cow Ghee
                        </div>
                        <div class="excerpt fadeInDown-2 hidden-xs">
                            <span>The power that will<br />become a winner will give.</span>
                        </div>
                        <div  >
                            <a href="#" style="background-color:White;color:Red;">Shop Now</a>
                        </div>
                    </div>
                    <!-- /.caption -->
                </div>
                <!-- /.container-fluid -->
            </div>
            <br />
            <!-- /.item -->
        </ItemTemplate>
    </asp:Repeater>
    </div>

C#

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

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
    {          
        Files file = (e.Item.DataItem as Files);
        Byte[] bytes = file.Data;
        string base64 = Convert.ToBase64String(bytes);
        string imageURL = string.Format("data:image/gif;base64," + base64 + ");");
        HtmlControl DvItem = (e.Item.FindControl("DvItem") as HtmlControl);
        DvItem.Style["background-image"] = @"url(" + imageURL + ") no-repeat;";
        DvItem.Style["background-repeat"] = @"no-repeat";
       
    }
}
private void BindRepeaterusingDataTable()
{
    List<Files> files = new List<Files>();

    string constr = ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("select Name, Data from tblFiles", con))
        {
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            sda.Fill(dt);

            for (int i = 0; i < dt.Rows.Count; i++)
            {
                files.Add(new Files
                {
                    Name = dt.Rows[i]["Name"].ToString(),
                    Data = (byte[])dt.Rows[i]["Data"]
                });
            }
        }

        Repeater1.DataSource = files;
        Repeater1.DataBind();
    }
}
 
public class Files
{
    public string Name { get; set; }
    public byte[] Data { get; set; }
}

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
	If Not Me.IsPostBack Then
		BindRepeaterusingDataTable()
	End If
End Sub

Protected Sub Repeater1_ItemDataBound(sender As Object, e As RepeaterItemEventArgs)
	If e.Item.ItemType = ListItemType.AlternatingItem OrElse e.Item.ItemType = ListItemType.Item Then
		Dim file As Files = TryCast(e.Item.DataItem, Files)
		Dim bytes As [Byte]() = file.Data
		Dim base64 As String = Convert.ToBase64String(bytes)
		Dim imageURL As String = String.Format((Convert.ToString("data:image/gif;base64,") & base64) + ");")
		Dim DvItem As HtmlControl = TryCast(e.Item.FindControl("DvItem"), HtmlControl)
		DvItem.Style("background-image") = (Convert.ToString("url(") & imageURL) + ") no-repeat;"

		DvItem.Style("background-repeat") = "no-repeat"
	End If
End Sub
Private Sub BindRepeaterusingDataTable()
	Dim files As New List(Of Files)()

	Dim constr As String = ConfigurationManager.ConnectionStrings("ConStr").ConnectionString
	Using con As New SqlConnection(constr)
		Using cmd As New SqlCommand("select Name, Data from tblFiles", con)
			Dim sda As New SqlDataAdapter(cmd)
			Dim dt As New DataTable()
			sda.Fill(dt)

			For i As Integer = 0 To dt.Rows.Count - 1
				files.Add(New Files() With { _
					Key .Name = dt.Rows(i)("Name").ToString(), _
					Key .Data = DirectCast(dt.Rows(i)("Data"), Byte()) _
				})
			Next
		End Using

		Repeater1.DataSource = files
		Repeater1.DataBind()
	End Using
End Sub

Public Class Files
	Public Property Name() As String
		Get
			Return m_Name
		End Get
		Set
			m_Name = Value
		End Set
	End Property
	Private m_Name As String
	Public Property Data() As Byte()
		Get
			Return m_Data
		End Get
		Set
			m_Data = Value
		End Set
	End Property
	Private m_Data As Byte()
End Class

Output