How to Write Select Query in 3Tier architecture?

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Here is aspx.cs file code

protected void Page_Load(object sender, EventArgs e)
{
if (Request.QueryString["eid"] != null)
{
if (!Page.IsPostBack)
{
SqlDataAdapter da1 = new SqlDataAdapter("Select * from tbl_catinfo where cat_id = '" + Request.QueryString["eid"] + "'", con);
DataTable dt1 = new DataTable();
da1.Fill(dt1);
txtID.Text = dt1.Rows[0][0].ToString();
txtCategory.Text = dt1.Rows[0][1].ToString();
ddlStatus.SelectedValue = dt1.Rows[0][2].ToString();
}
}
}

Here is aspx code

XML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<pre lang="xml">&lt;asp:TemplateField HeaderText=&quot;Action&quot;&gt;

                &lt;ItemTemplate&gt;</pre>


 <a href="AddCategory.aspx?eid=<%# Eval("cat_id") %>"><img src="images/icon_edit.gif" alt="Edit" width="16" height="16" border="0"   /></a>
</ItemTemplate>
            </asp:TemplateField>

        </Columns>
    </asp:GridView>

Posted 12-Mar-13 22:40pm

Arpit6016

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Prasad Khandekar · Answer 1 · 2013-03-12T23:55:00

Hello Arpit,

The code behind in your case will look something like

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (Request.QueryString["eid"] != null)
    {
        if (!Page.IsPostBack)
        {
            SqlConnection sqlCon;
            SqlCommand sqlCmd;
            SqlDataReader sqlRdr;

             sqlCon = new SqlConnection();   
             sqlCon.ConnectionString = ConfigurationManager.ConnectionStrings["YOURDB"].ConnectionString;   
             sqlCmd = new SqlCommand();
             sqlCmd.CommandText = "SELECT * FROM tbl_catinfo WHERE cat_id = @cat_id";
             sqlCmd.Parameters.Add("@cat_id", Request.QueryString["eid"]);
             sqlCmd.Connection = sqlCon;
             sqlCmd.Connection.Open();
             sqlRdr = sqlCmd.ExecuteReader(CommandBehavior.CloseConnection);
             GridView1.DataSource = sqlRdr;
             GridView1.DataBind();

             sqlCmd.Dispose();
             sqlCon.Dispose();
        }
    }
}

Regards,