1
Answer

Paint Event

VNT

VNT

19y
2.1k
1
Hi all, I have a function DisplayIt() to draw something and use the Paint event or DisplayPanel_Paint() to call and display it. However my Display() function is called at least 2 or more times. - Why is that? and how do i prevent it? private void DisplayPanel_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { DisplayIt(); } Many thanks Trevor
Answers (1)
0
Senthilkumar

Senthilkumar

NA 15.2k 2.4m 12y
Hi,

As per as my knowledge is concerned, yes you are right! you need to store in any one of them...

Accepted
0
Ilkin East

Ilkin East

NA 100 126.9k 12y
Thank You Senthilkumar!!

Everything is ok.What if we try to do it in windows application.I need to store it anyware.In a file,xml,database?

Thanks .

 
0
Senthilkumar

Senthilkumar

NA 15.2k 2.4m 12y
Hi,

The reason is i think you have not stored the data some where and need to add from the stored data.

I have done the example page. You can change the field name or design.

Design page:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AddRows.aspx.cs" Inherits="Corner_AddRows" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table cellpadding="0" cellspacing="0" border="0" width="100%">
            <tr>
                <td style="text-align: right">
                    Enter the First Name:
                </td>
                <td>
                    <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td style="text-align: right">
                    Enter the Last Name:
                </td>
                <td>
                    <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td colspan="2" style="text-align: center">
                    <asp:Button ID="btnAdd" runat="server" Text="Add" onclick="btnAdd_Click" />
                </td>
            </tr>
            <tr>
                <td colspan="2" style="text-align: center">
                    <asp:GridView ID="gvList" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None"
                        Width="544px">
                        <RowStyle BackColor="#EFF3FB" />
                        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                        <EditRowStyle BackColor="#2461BF" />
                        <AlternatingRowStyle BackColor="White" />
                    </asp:GridView>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>


Code File:

   protected void Page_Load(object sender, EventArgs e)
    {
        
        if (Session["UsersTable"] != null)
        {
            DataTable dt = (DataTable)Session["UsersTable"];
        }
        
    }
    
    private void BindTable(DataTable dt)
    {
        gvList.DataSource = dt;
        gvList.DataBind();
        Session["UsersTable"] = dt;
    }

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        DataTable dtCurrent = null;

        if (Session["UsersTable"] != null)
        {
            dtCurrent = (DataTable)Session["UsersTable"];
        }
        else
        {
            dtCurrent = CreateTable();
        }

        DataRow dRow = dtCurrent.NewRow();
        dRow["FName"] = txtFirstName.Text.Trim();
        dRow["LName"] = txtLastName.Text.Trim();
        dtCurrent.Rows.Add(dRow);
        BindTable(dtCurrent);

    }

    private DataTable CreateTable()
    {
        DataTable dtable = new DataTable();
        DataColumn dColumn = null;
        DataRow dRow = null;

        dColumn = new DataColumn();
        dColumn.ColumnName = "FName";
        dtable.Columns.Add(dColumn);

        dColumn = new DataColumn();
        dColumn.ColumnName = "LName";
        dtable.Columns.Add(dColumn);

        return dtable;
    }

Hope this will help you.



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