Here I am going to explain how to show state
wise city list in DropDownList in Asp.net like below Image.
I have two tables in database like :
Now write the below code On the Page_Load in
Asp.net
protected
void Page_Load(object
sender, EventArgs e)
{
SqlConnection cn =
new SqlConnection("Data
Source=BCILGGN13\\SQLEXPRESS;Initial catalog=Test; Uid=sa; Pwd=bcil;");
DataTable dt;
DataTable dt1;
SqlDataAdapter adap;
if (!IsPostBack)
{
ddlCity.AppendDataBoundItems = true;
ddlCity.Items.Insert(0, "-select-");
adap =
new SqlDataAdapter("select
* from State_List", cn);
dt =
new DataTable();
adap.Fill(dt);
int j = 0;
if (dt.Rows.Count > 0)
{
j = 1;
for (int i =
0; i < dt.Rows.Count; i++)
{
ddlCity.Items.Add(dt.Rows[i]["State"].ToString());
ddlCity.Items[j].Attributes.Add("style",
"color:red");
adap =
new SqlDataAdapter("select
City from city_list where state= '" + dt.Rows[i]["State"]
+ "'", cn);
dt1 =
new DataTable();
adap.Fill(dt1);
for (int k =
0; k < dt1.Rows.Count; k++)
{
ddlCity.Items.Add(dt1.Rows[k]["City"].ToString());
}
j = dt1.Rows.Count +j+1;
}
}
}
}