Interface
June 9, 2010 2 Comments
Multiple inheritance is not supported by c#. Instead of that we use interfaces for avoiding ambiguity in C++ , where the object of the class doesn’t know which method to call if the base classes have two methods of the same name.
interfaces are defined in parent and implemented by derived class it have indexers, methods and properties.
for example:
interface Newinterface
{
void Mymethod();
}
interfaces are declared with keyword 'Interface' .
using System;
interface BaseInterface
{
void BaseToImplemen();
}
interface Childinterface: BaseInterface
{
void childToImplement();
}
class Newchild : Childinterface
{
static void Main()
{
InterfaceImplementer iImp = new InterfaceImplementer();
iImp.childToImplement();
iImp.BaseToImplemen();
}
public void childToImplement()
{
Console.WriteLine("childToImplement() called.");
}
public void BaseToImplemen();
{
Console.WriteLine("BaseToImplemen();called.");
}
}
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hi,
i am creating a web page using master pages. in my default.aspx page i have a textbox, a button , a fileupload control
and a drop down. fileupload is hidden . i want taht when i click on button control ——– fileupload clicked automatic
and the selected path is shown is textbox control after that a function is called that fill the drop down .
in aspx page :
in aspx.cs page
protected void Button6_Click(object sender, EventArgs e)
{
Type cty=this.GetType();
System.Text.StringBuilder script = new System.Text.StringBuilder();
string fileID = FileUpload2.ClientID;
string pathtext = TextBox1.ClientID;
script.Append(“”);
script.Append(“document.getElementById(‘”);
script.Append(fileID);
script.Append(“‘).click();”);
script.Append(“document.getElementById(‘”);
script.Append(pathtext);
script.Append(“‘).value=”);
script.Append(“document.getElementById(‘”);
script.Append(fileID);
script.Append(“‘).value;”);
script.Append(“”);
ClientScript.RegisterStartupScript(cty, “scriptpage”, script.ToString());
callfill();
}
public void callfill()
{
OleDbConnection conn = getconnection();
String[] item = getSheetName(conn);
//for (int i = 0; i < item.Length; i++)
//{
// DropDownList1.Items.Add(item[i].ToString());
//}
//}
private String getFileName()
{
//Response.Write("aaa" +TextBox1.Text);
//return "a";
return TextBox1.Text;
}
private OleDbConnection getconnection()
{
string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + getFileName() + ";Extended Properties=Excel 8.0";
return new OleDbConnection(connString);
}
but getfilename method is not able to read textbox1 value.
please tell a solution of it.
thanks
Alka
use viewState to hold the filename acrosspostback
so viewState["filename"] = Textbox1.Text;
and pass the viewstate directly on your query..
ie: Viewstate["filename"].ToString()
I think this may help you../