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Asked: 2026-06-12T08:06:27+00:00

I’m new to Asp.net and site building, but I started with Webmatrix Webpages and

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I’m new to Asp.net and site building, but I started with Webmatrix Webpages and I’m actually progressing very much in my website.
But I’m now stuck in a piece of razor code. I get the error:
Object reference not set to an instance of an object.
in line:
foreach(Control c1 in Page.Controls)

@{
    var db = Database.Open("DOM Coins");
    var codigo_campo_ID_unico=0;
    var valor_BC=0;


    if(IsPost){

        foreach(Control c1 in Page.Controls){
            foreach(Control c in c1.Controls){
            if (c.GetType().ToString() == "System.Web.UI.WebControls.TextBox"){
                if (c.ID=="BC_8"){
                   if (c.ID.Substring(0,2)=="BC"){
                      codigo_campo_ID_unico=int.Parse(c.ID.Substring(3,c.ID.Length-3));
                      valor_BC=int.Parse(Request[c.ID]);


                       db.Execute("UPDATE Coleccao SET Quantidade_BC=@valor_BC WHERE Id=@codigo_campo_ID_unico");
                   }
                }
            }
            }
        }
    }

}

Teh reason I want to do this is because I’m creating textboxes dinamically, each one with a different ID, and I want to iterate through all of them and insert the data to the DB.

Any help would be apreciated.

Thanks in advance,
Dinis.

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1 Answer

  1. Editorial Team

    The code in the following creates a form with a variable number of text fields and reads their content storing it into a list.

    @{
    var num = 3; // number of text fields to create
    List<string> nText = new List<string>();
    if (IsPost)
    {
        for (int i = 0; i < num; i++)
        {
            var name = "txt" + i.ToString();
            nText.Add(Request.Form[name]);
        }
    }
}

<!DOCTYPE html>

<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <form method="post">
            @for (int i = 0; i < num; i++)
            {
                var name = "txt" + i.ToString();
                <p>@name
                <input type="text" name="@name" />
                </p>
            }
            <input type="submit" />
        </form>
    </body>
</html>

    With small changes you could insert the text fields values into table records.

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