How to require text in a Textbox?

Allen Scott 2066 25 Nov 2014

How do I go about requiring text in a textbox? This is what i have so far.

String strName = txtName.Text;
String strEmail = txtEmail.Text;
Boolean blnErrors = false;
 
if (strName == null)
{
 
}
else
{
    string script ="alert(\"Name Field Is Required!\");";
   
ScriptManager.RegisterStartupScript(this, GetType(),
"ServerControlScript", script, true);
 
    txtName.Focus();
}

When I run the program and try to execute it, I get the error popping up regardless if I have text entered into the textbox or not. I only want the Error to show if There is Nothing in the TextBox. I have also tried using,

if (strName == "")

as well. But nothing changes.

Ask by Allen Scott

Updated 26 Nov 2014

1 Answers

Anonymous User 26 Nov 2014

String strName = txtName.Text.Trim(); //add trim here
String strEmail = txtEmail.Text;
Boolean blnErrors = false;
 
if (string.IsNullOrWhiteSpace(sstrName)) //this function
checks for both null or empty string.
{
    string script ="alert(\"Name Field Is Required!\");";
   
ScriptManager.RegisterStartupScript(this, GetType(),
"ServerControlScript", script, true);
    txtName.Focus();
    return;//return
from the function as there is an error.
}

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