how to show publish version in a textbox?

Try this:

using System.Deployment.Application;

public Version AssemblyVersion 
{
    get
    {
        return ApplicationDeployment.CurrentDeployment.CurrentVersion;
    }
}

Then the caller to the getter property can de-reference the Major, Minor, Build and Revision properties, like this:

YourVersionTextBox.Text = AssemblyVersion.Major.ToString() + "."
                        + AssemblyVersion.Minor.ToString() + "."
                        + AssemblyVersion.Build.ToString() + "."
                        + AssemblyVersion.Revision.ToString();

Don't forget to check if the application is networkdeployed otherwise it won't work in debug mode.

if (ApplicationDeployment.IsNetworkDeployed)
{
    this.Text = string.Format("Your application name - v{0}",
        ApplicationDeployment.CurrentDeployment.CurrentVersion.ToString(4));
}