CasCading DropDownList using Array in Asp.net

Category: ASP.NETC#.Net Comments: No comments

Sometimes we need to do fill dropdownlist using Array(2 Dimensional and 3 Dimensional) For Static Value in Asp.net

Explanation given below:

Design Page:

<div>
<asp:DropDownList ID=”ddlCountry” runat=”server” AutoPostBack=”True”
onselectedindexchanged=”ddlCountry_SelectedIndexChanged”>
</asp:DropDownList>
<asp:DropDownList ID=”ddlState” runat=”server”>
</asp:DropDownList>
</div>

Code Page:

protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
BindCountry();
}
}
public void BindCountry()
{
string[,] Country = { { “India”, “1″ }, { “US”, “2″ } };
int rows = Country.GetUpperBound(0);
int columns = Country.GetUpperBound(1);

for (int currentRow = 0; currentRow <= rows; currentRow++)
{
ListItem li = new ListItem();
for (int currentColumn = 0; currentColumn <= columns; currentColumn++)
{
if (currentColumn == 0)
{
li.Text = Country[currentRow, currentColumn];
}
else
{
li.Value = Country[currentRow, currentColumn];
}
}
ddlCountry.Items.Add(li);
}

}
public void BindState(int id)
{
string[, ,] State = { {{ “UP”, “1″, “1″ }},
{ {“Patna”, “2″, “1″ }},
{{ “Delhi”, “3″, “1″ }},
{ {“Haryana”, “4″, “1″ }},
{ {“AK – Alaska”, “14″, “2″ }},
{ {“AL – Alabama”, “15″, “2″ }},
{ {“AR – Arkansas”, “16″, “2″ }} ,
{ {“AZ – Arizona”, “17″, “2″ } },
{ {“CA – California”, “18″, “2″ }},
{ {“CO – Colorado”, “19″, “2″ }},
{ {“CT – Connecticut”, “20″, “2″ }},
};
DataTable objDat = new DataTable();
objDat.Columns.Add(“StateName”, typeof(string));
objDat.Columns.Add(“SId”, typeof(string));
objDat.Columns.Add(“CId”, typeof(string));
for (int i = 0; i < State.Length/3; i++)
{

DataRow dr = objDat.NewRow();
dr["StateName"]= State[i,0,0];
dr["SId"] = State[i, 0, 1];
dr["CId"] = State[i, 0, 2];
objDat.Rows.Add(dr);

}

DataRow[] drData = objDat.Select(“CId=” + id);
DataTable dt1 = drData.CopyToDataTable();
ddlState.DataSource = dt1;
ddlState.DataTextField = “StateName”;
ddlState.DataValueField = “SId”;
ddlState.DataBind();
}
protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
{

if (Convert.ToInt32(ddlCountry.SelectedValue) > 0)
{
BindState(Convert.ToInt32(ddlCountry.SelectedValue));
}
}

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