With the XMLHttpRequest object, Microsoft Internet Explorer clients can retrieve and submit XML data directly to a Web server without reloading the page. To convert XML data into renderable HTML content, use the client-side XML DOM or Extensible Stylesheet Language Transformations (XSLT) to compose HTML elements for presentation.
This tutorial will show you how to Working with DropDownLists by ajax using ASP.NET 2.0 and C#.
First, you need to import the namespace from System.Data.SqlClient.
First, you need to import the namespace from System.Data.SqlClient.
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using System.Data.SqlClient;
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The System.Data.SqlClient namespace contains The System.Data.SqlClient namespace is the .NET Framework Data Provider for SQL Server.The .NET Framework Data Provider for SQL Server describes a collection of classes used to access a SQL Server database in the managed space.
In order to working with AJAX, we need XMLHttpRequest object. With the XMLHttpRequest object, Microsoft Internet Explorer clients can retrieve and submit XML data directly to a Web server without reloading the page. To convert XML data into renderable HTML content, use the client-side XML DOM or Extensible Stylesheet Language Transformations (XSLT) to compose HTML elements for presentation. In tutorial, we need a DropDownLists with being embedded Div also.
The code is simple, there is nothing complex in it. In the page load event, I am register the attribute of Drowdownlist. It is for checking whether the ProvinceID is empty. If it is not be empty, I will call the function bind.
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if (!Page.IsPostBack)
{
this.DropDownList1.Attributes.Add("onchange", "return startRequest();");
ListProvince();
if (ProvinceID != "")
{
GetCityByProvinceID(ProvinceID);
}
}
private DataSet GetDataSet(string sql)
{
string constring=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
SqlDataAdapter sda =new SqlDataAdapter(sql,constring);
DataSet ds=new DataSet();
sda.Fill(ds);
return ds;
}
private void GetCityByProvinceID(string ProvinceID)
{
string connStr = ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection conn = new SqlConnection(connStr);
string sql = "select * from authors where au_id='" + ProvinceID + "'";
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
string s = @"<table cellspacing='0' cellpadding='4' border='0' id='GridView1' style='color:#333333;border-collapse:collapse;'>";
s+="<tr style='color:White;background-color:#990000;font-weight:bold;'>";
s += "<th scope='col'>Authors_ID</th><th scope='col'>FirstName</th><th scope='col'>City</th>
<th scope='col'>Phone</th><th scope='col'>state</th><th scope='col'>zip</th></tr>";
int m = 0;
while (dr.Read())
{
if (m % 2 == 0)
{
s += "<tr style='color:#333333;background-color:#FFFBD6;'>";
}
else
{
s += "<tr style='color:#333333;background-color:White;'>";
}
m++;
s += "<td>" + dr["au_id"] + "</td>";
s += "<td>" + dr["au_fname"] + "</td>";
s += "<td>" + dr["city"] + "</td>";
s += "<td>" + dr["phone"] + "</td>";
s += "<td>" + dr["state"] + "</td>";
s += "<td>" + dr["zip"] + "</td>";
s += "</tr>";</tr>
}
s+="</table>";
dr.Close();
conn.Close();
this.Response.Write(s);
this.Response.End();
}
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