How to add a required field validator in my dynamically generated textboxes

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Hi Every one,
How to add a required field validator in my dynamically generated textboxes? Please help.
My code is

protected void Button1_Click(object sender, EventArgs e)
   {
       if (txtQuantity.Text != "")
       {
           for (int i = 0; i <= Convert.ToInt16(txtQuantity.Text) / 3; i++)
           {
               Label la = new Label();
               la.Text = ddlProductName.SelectedItem.Value + (i+1).ToString();
               la.ID = "abc1" + i;

               PlaceHolder1.Controls.Add(la);
               //la = FindControl(String.Format(i)) as Label;

               TextBox txtbox = new TextBox();
               // txtbox.Text = "Textbox - " + i.ToString();

               PlaceHolder1.Controls.Add(new LiteralControl("<input id='txt' name='Textbox" + i + "'type='text'  />"));
               PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
               //RequiredFieldValidator val = new RequiredFieldValidator();
               //TextBox txt = PlaceHolder1.FindControl("<input id='txt' name='Textbox" + i + "'type='text'  />") as TextBox;
               //val.ControlToValidate = txt.Text;
               //val.ErrorMessage = "Enter serial No";
               //PlaceHolder1.Controls.Add(val);
           }
           for (int j = (Convert.ToInt16(txtQuantity.Text) / 3)+1 ; j <= Convert.ToInt16(txtQuantity.Text)*2/3; j++)
           {
               Label la1 = new Label();
               la1.Text = ddlProductName.SelectedItem.Value + (j+1).ToString();
               la1.ID = "abc2" + j;

               PlaceHolder2.Controls.Add(la1);
               //la = FindControl(String.Format(i)) as Label;
               TextBox txtbox1 = new TextBox();
               // txtbox.Text = "Textbox - " + i.ToString();
                 PlaceHolder2.Controls.Add(new LiteralControl("<input id='txt' name='Textbox" + j + "'type='text'  />"));
               PlaceHolder2.Controls.Add(new LiteralControl("<br />"));
               //RequiredFieldValidator val = new RequiredFieldValidator();
               //val.ControlToValidate = "<input id='txt' name='Textbox" + j + "'type='text'  />";
               //val.ErrorMessage = "Enter serial No";
               //PlaceHolder2.Controls.Add(val);
           }
           for (int k = (Convert.ToInt16(txtQuantity.Text)*2/3)+1; k < Convert.ToInt16(txtQuantity.Text) ; k++)
           {
               Label la2 = new Label();
               la2.Text = ddlProductName.SelectedItem.Value + (k + 1).ToString();
               la2.ID = "abc3" + k;

               PlaceHolder3.Controls.Add(la2);
               //la = FindControl(String.Format(i)) as Label;
               TextBox txtbox1 = new TextBox();
               // txtbox.Text = "Textbox - " + i.ToString();
               PlaceHolder3.Controls.Add(new LiteralControl("<input id='txt' name='Textbox" + k + "'type='text'  />"));
               PlaceHolder3.Controls.Add(new LiteralControl("<br />"));

           }
           }
       }

Posted 9-Jun-14 1:57am

Member 10578683

Updated 9-Jun-14 2:26am

sankarsan parida

v2

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sankarsan parida · Answer 1 · 2014-06-09T02:50:00

Just see the following demo code which is done to give one example and edit your code. This is a example for to add dynamically requiredfield validation in textbox.

protected void Page_Load(object sender, EventArgs e)
   {
       for (int i = 0; i < 2; i++)
       {
           TextBox txt = new TextBox();
           txt.ID = "txt" + i;
           Panel1.Controls.Add(txt);
           RequiredFieldValidator rfv = new RequiredFieldValidator();
           rfv.ID = "rfv" + i;
           rfv.ControlToValidate = "txt" + i;
           rfv.ErrorMessage = "should not blank";
           Panel1.Controls.Add(rfv);
       }
   }

When you will add required Fieldvalidator dynamically. it will throw error :" WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for jQuery ";

We will resolve this on different way:
First case:
Add below code inside web.config file.

<configuration>
 <appsettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
  </appsettings> 
</configuration>

OR Second Case
Add this code in Global.asax file inside Application_start event

void Application_Start(object sender, EventArgs e)
   {
       // Code that runs on application startup
       ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition
       {
           Path = "~/scripts/jquery-1.4.1.min.js",
           DebugPath = "~/scripts/jquery-1.4.1.js",
           CdnPath = "http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.1.min.js",
           CdnDebugPath = "http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.1.js"
       });
   }

Use any one of First case or second case it will work.
I hope this will help you very much