How to retrieve image from database saved path on DropdownList Selected Value Changed using c# asp.net?

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C#

ASP.NET

SQL-Server

Hello,

How to retrieve image from database saved path on DropdownList Selected Value Changed using c# asp.net?

I am using code for display in image url but my image is not displaying.
My text is displaying but my image it's not displaying.
My code is:-

protected void DDLCity_SelectedIndexChanged(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(connectionString);
        
        SqlCommand cmd = new SqlCommand("procGetSponsorDetails",con);
        con.Open();
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.Add("@CityId", SqlDbType.Int).Value = DDLCity.SelectedItem.Value;
        SqlDataReader sdr = cmd.ExecuteReader();
        //cmd.ExecuteReader();
        if (sdr.Read())
        {
            
            ImgLogoSponsor.ImageUrl = Server.MapPath("~/Templates/") + sdr[0].ToString();
            LblAllotedCards.Text = sdr[10].ToString();
        
        }
        sdr.Close();
con.Close();
}
}

DropdownList and Image in Update panel.
please help me.

Thanks in Advance.

Ankit Agarwal
Website Developer