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Editorial Team
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Asked: 2026-05-14T06:46:21+00:00

I’m working on an ASP.NET/C# app. I have 2 text boxes and I need

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I’m working on an ASP.NET/C# app.

I have 2 text boxes and I need to validate if the input text for both of them are not both null
ex:

if(string.IsNullOrEmpty(TextBox1.Text) && string.IsNullOrEmpty(TextBox2.Text) )
   //FAIL!!!  
else
   // OK!

that is, at least one txtBox has values

I was planning on using a custom validator but it seems that the validation function only gets called when something is written on the textBox i’m using has the ‘control to validate’. Now, that doesn’t work for me since I want to show an error message when both text boxes are empty. Is there a way to make the validation function to be called with, for example a postback? Or is there any other better approach to this case than the custom validator?

tks

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1 Answer

  1. Editorial Team

    If you set the ‘ControlToValidate’, then the validator will not fire if that control is empty. However, for a CustomValidator you can leave that empty so it will always fire.

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