Access Call master page method in child page using C# in ASP.Net

Question

_{Tuesday, February 12, 2019 7:12 AM}

Hi all, I need your help.

I have created in my website in c# the MasterPage Mpdue.

In this MasterPage  **Mpdue **I have insert UserName method.

Now I need access call master page method UserName in child page using C# in ASP.Net.

 I can't call the method UserName() method in child page.

Can you help me ?

My code below.

MasterPage Mpdue code-behind

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        UserName();
    }
}


protected void UserName()
{

    sql = @String.Format(" SELECT * FROM ");
    sql += String.Format(" tbl_user ");
    sql += String.Format(" WHERE username IN (?); ");

    using (OdbcConnection myConnectionString =
        new OdbcConnection(ConfigurationManager.ConnectionStrings["ConnMySQL"].ConnectionString))
    {
        using (OdbcCommand command =
            new OdbcCommand(sql, myConnectionString))
        {
            try
            {
                if (username != null)
                {
                    command.Parameters.AddWithValue("param1", username.ToString().ToUpper());
                    command.Connection.Open();

                    using (OdbcDataReader reader = command.ExecuteReader())
                    {
                        if (reader.HasRows)
                        {
                            while (reader.Read())
                            {
                                TES = reader["TES"].ToString();
                                colorList.Add(TES.ToString());
                            }

                            ns = "";
                            ns = string.Join(",", (from co in colorList select "?").ToList());
                        }
                    }
                }

            }
            catch (Exception ex)
            {
                throw new ApplicationException("operation failed!", ex);
            }
            finally
            {
                command.Connection.Close();
            }
        } 
    } 
}

Child page code-behind

private void sDDL()
{
    sDDL.AppendDataBoundItems = true;

    sql = @String.Format(" SELECT ");
    sql += String.Format("      AREA ");
    sql += String.Format("  FROM ");
    sql += String.Format("      `tbl_area` ");
    sql += String.Format("  WHERE CO IN ({0}) ", ns);

    sql += String.Format("  GROUP BY ");
    sql += String.Format("      AREA; ");

    using (OdbcConnection myConnectionString =
      new OdbcConnection(ConfigurationManager.ConnectionStrings["ConnMySQL"].ConnectionString))
    {
        using (OdbcCommand cmd =
            new OdbcCommand(sql, myConnectionString))
        {
            foreach (var co in colorList)
            {
                cmd.Parameters.AddWithValue(co, co);
            }

            cmd.CommandType = CommandType.Text;
            cmd.Connection.Open();

            using (OdbcDataAdapter sda =
                new OdbcDataAdapter(cmd))
            {
                sda.Fill(dsProducts);
                sDDL.DataSource = dsProducts.Tables[0];
                sDDL.DataTextField = "AREA ";
                sDDL.DataValueField = "AREA ";
                sDDL.DataBind();
            }
        }
    }
}

Markup child page :

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="sDefault.aspx.cs" Inherits="sDefault" EnableEventValidation="false" MasterPageFile="Mpdue.master" %>
<%@ MasterType VirtualPath="Mpdue.master" %>  
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

...

</asp:Content>

All replies (4)

_{Wednesday, February 20, 2019 2:21 PM ✅Answered}

Solved:

MasterPage Mpdue code-behind

private static string theObjectName;

public static string TheObjectPropertyName
{
      get { return this.theObjectName; }
}

protected void UserName()
{
     ...
     ...

     theObjectName = = reader["TES"].ToString();

}

Child page code-behind

protected void Page_Load(object sender, EventArgs e)
{
    Response.Write(Mpdue.TheObjectPropertyName.ToString());
}

**Markup child page **

<%@ Page Title="" Language="C#" MasterPageFile="Mpdue.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ MasterType VirtualPath="Mpdue.master" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
</asp:Content>

_{Tuesday, February 12, 2019 1:14 PM}

Looks you want reuse an existing function/sub, I suggest you move your function to another file in app_code then call it whenever you need, on Master Page or any other Page

_{Wednesday, February 13, 2019 7:14 AM}

Hi 

According to your description, I suggest that you could add the MasterType directive to your page markup at the top, where the standard <%@ Page %> directive is.

<%@ MasterType TypeName="YourNamespace.YourMasterPageType" %>

Then in your child page code, you could just add:

Master.Username();

For more about how to call method from master page you coulf refer to the following thread,

https://stackoverflow.com/questions/6332889/call-method-in-master-page

https://stackoverflow.com/questions/19265135/access-master-page-method-in-asp-net-c-sharp

https://stackoverflow.com/questions/5068521/how-to-use-a-method-in-a-master-page-from-a-content-page

Best Regards,

Jenifer

_{Tuesday, February 19, 2019 10:12 AM}

Thank you for help, but your suggestion is  ineffective, in my case.

In code-behind the UserName method is not available.

I have added the MasterType directive to my page markup at the top :

<%@ MasterType TypeName="Mpdue" %>