Help with form submit buttons and code behind

[mjcs100]

Hi I was wandering if someone could help me with a problem I'm having with my code behind for my submit buttons. What I did was create an html form in Dreamweaver and I created the code behind in Visual Studio 2005 to work with it. I have created a couple of applications in the past like this to work with a couple of other webpages I have but without the submit buttons being used this way and they work fine. Now I have 3 different html pages with the same thing, 2 forms and a submit button with the text "Download" for each one but has a different "ID". All the buttons are calling the same code behind. In the code behind, I want to have it distinguish which button was clicked by the "ID". I created a dummy in Visual Studio on the .aspx page with the buttons and it works but when I use the html page for it, and delete the info on the .aspx page, it won't post back to the html. I tried a couple of different ways to get the page_load event to recognize the html form, but been having no luck. Here is one of the codes I am trying to use, and I was wandering if someone could help me figure out what I am doing wrong.

 

The html page's button's names and the buttons in visual studio are the exact same.

protected void Page_Load(object sender, EventArgs e)
   {
           btn1.Click += new System.EventHandler(this.Download);
           btn2.Click += new System.EventHandler(this.Download);
           btn3.Click += new System.EventHandler(this.Download);
           btn4.Click += new System.EventHandler(this.Download);
           btn5.Click += new System.EventHandler(this.Download);
           btn6.Click += new System.EventHandler(this.Download);
           btn7.Click += new System.EventHandler(this.Download);
           btn8.Click += new System.EventHandler(this.Download);
   }

   protected void Download(object sender, System.EventArgs e)
   {
       switch (((Button)sender).OnClientClick)
       {
           case "btn1":
               //code for btn1.
	//code to updateDataBase
               break;
           case "btn2":
               //code for btn2.
		//code to updateDataBase
               break;
           case "btn3":
               //code for btn3
	//code to updateDataBase
               break;
           case "btn4":
               //code for btn4
	//code to updateDataBase
               break;
           case "btn5":
               //code for btn5
	//code to updateDataBase
               break;
           case "btn6":
               //code for btn6
	//code to updateDataBase
               break;
           case "btn7":
               //code for btn7
	//code to updateDataBase
               break;
           case "btn8":
               //code for btn8
	//code to updateDataBase
               break;
       }

       lblStatus.Text = dlID.ToString();
   }
   private void UpdateDataBase(object sender)
   {
       try
       {
           dbConn.ConnectionString = //code to access mssql database
           dbConn.Open();
           dbCommand.Connection = dbConn;
           dbCommand.CommandText = "SELECT * FROM table WHERE column='" + btnClicked + "'";
           dbReader = dbCommand.ExecuteReader();

           if (dbReader.Read())
           {
               if (btnClicked == dbReader["column"].ToString())
               {
                   dlID = Convert.ToInt32(dbReader["column"]);

                   dlID++;

                   dbConn.Close();

                   try
                   {
                       dbConn.ConnectionString = //code to access mssql database
                       dbConn.Open();
                       dbCommand.Connection = dbConn;
                       dbCommand.CommandText = "UPDATE table SET acolumn= '" + dlID + "' WHERE acolumn = '" + btnClicked + " '";
                       dbReader = dbCommand.ExecuteReader();

                       lblStatus.Text = dlID.ToString();
                   }
                   catch (Exception ex)
                   {
                       Response.Write("Error: " + ex.Message);
                   }
               }
           }

       }
       catch (Exception ex)
       {
           Response.Write("Error: " + ex.Message);
       }

       finally
       {
           dbConn.Close();
       }
   }

____________________________________________________________

 

This is the second way I tried it and no luck with this one.

protected void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
       {
           
       }
       else
       {
           lblStatus.Text = dlID.ToString();
       }
   }

protected void btn1_Click(object sender, EventArgs e)
   {
       code for btn1
   }
protected void btn2_Click(object sender, EventArgs e)
   {
       code for btn2
   }
protected void btn3_Click(object sender, EventArgs e)
   {
       code for btn3
   }
protected void btn4_Click(object sender, EventArgs e)
   {
       code for btn4
   }
protected void btn5_Click(object sender, EventArgs e)
   {
       code for btn5
   }
protected void btn6_Click(object sender, EventArgs e)
   {
       code for btn6
   }
protected void btn7_Click(object sender, EventArgs e)
   {
       code for btn7
   }
protected void btn8_Click(object sender, EventArgs e)
   {
       code for btn8
   }

private void UpdateDataBase(object sender)
   {
       try
       {
           dbConn.ConnectionString = //code to access mssql database
           dbConn.Open();
           dbCommand.Connection = dbConn;
           dbCommand.CommandText = "SELECT * FROM table WHERE column='" + btnClicked + "'";
           dbReader = dbCommand.ExecuteReader();

           if (dbReader.Read())
           {
               if (btnClicked == dbReader["column"].ToString())
               {
                   dlID = Convert.ToInt32(dbReader["column"]);

                   dlID++;

                   dbConn.Close();

                   try
                   {
                       dbConn.ConnectionString = //code to access mssql database
                       dbConn.Open();
                       dbCommand.Connection = dbConn;
                       dbCommand.CommandText = "UPDATE table SET acolumn= '" + dlID + "' WHERE acolumn = '" + btnClicked + " '";
                       dbReader = dbCommand.ExecuteReader();

                       lblStatus.Text = dlID.ToString();
                   }
                   catch (Exception ex)
                   {
                       Response.Write("Error: " + ex.Message);
                   }
               }
           }

       }
       catch (Exception ex)
       {
           Response.Write("Error: " + ex.Message);
       }

       finally
       {
           dbConn.Close();
       }
   }

______________________________________________________

 

This is my last way I have tried, but it keeps telling me "The event 'System.Web.UI.WebControls.Button.Click' can only appear on the left hand side of += or -=".

protected void Page_Load(object sender, EventArgs e)
   {
       if (btn1.Click = true)
       {
           code for btn1
       }
       else if (btn2.Click = true)
       {
           code for btn2
       }
       else if (btn3.Click = true)
       {
           code for btn3
       }
       else if (btn4.Click = true)
       {
           code for btn4
       }
       else if (btn5.Click = true)
       {
           code for btn5
       }
       else if (btn6.Click = true)
       {
           code for btn6
       }
       else if (btn7.Click = true)
       {
           code for btn7
       }
       else if (btn8.Click = true)
       {
           code for btn8
       }
  }

private void UpdateDataBase(object sender)
   {
       try
       {
           dbConn.ConnectionString = //code to access mssql database
           dbConn.Open();
           dbCommand.Connection = dbConn;
           dbCommand.CommandText = "SELECT * FROM table WHERE column='" + btnClicked + "'";
           dbReader = dbCommand.ExecuteReader();

           if (dbReader.Read())
           {
               if (btnClicked == dbReader["column"].ToString())
               {
                   dlID = Convert.ToInt32(dbReader["column"]);

                   dlID++;

                   dbConn.Close();

                   try
                   {
                       dbConn.ConnectionString = //code to access mssql database
                       dbConn.Open();
                       dbCommand.Connection = dbConn;
                       dbCommand.CommandText = "UPDATE table SET acolumn= '" + dlID + "' WHERE acolumn = '" + btnClicked + " '";
                       dbReader = dbCommand.ExecuteReader();

                       lblStatus.Text = dlID.ToString();
                   }
                   catch (Exception ex)
                   {
                       Response.Write("Error: " + ex.Message);
                   }
               }
           }

       }
       catch (Exception ex)
       {
           Response.Write("Error: " + ex.Message);
       }

       finally
       {
           dbConn.Close();
       }
   }

I hope someone will be able to help me. Thanks

Edited September 18, 2007 by PlausiblyDamp

[IxiRancid]

Hi,

I can only give you my code I use.

It's intention is dynamic addition of buttons and place them into a Placeholder.

 

Dim LinkB11 As New LinkButton
Dim oCnt As Integer = 1
LinkB11.Text = oCnt
LinkB11.ID = "LinkB" & oCnt
LinkB11.Attributes.Add("href", "javascript:__doPostBack('LinkB11','" & Trim(drSELECT1(1)) & "/" & Trim(drSELECT1(0)) & "')")

PlaceHolder1.Controls.Add(LinkB11)
oCnt += 1

 

And then in Page_Load event this code:

If Microsoft.VisualBasic.Left(Request.Form("__EVENTTARGET"), 5) = "LinkB" Then
LinkB11_Click(Request.Params.Get("__EVENTARGUMENT"))
End If

 

The main Click Sub is this:

Private Sub LinkB11_Click(ByVal mFf As String)
Response.Redirect("http://localhost/retailforms/subweb/" & Trim(mFf) & ".aspx")
End Sub

 

Don't know how this would act if you had premade HTML Buttons on the page. But perhaps it can help you catch the Button Click event.