String of the expression I defined from object type

if(a.Tostring()==textBox4.Text)Here is the reason why "a" is false even though it is equal to the textbox4.text statement.

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Hi,

What do you want to ask? Can you describe it ?

Why convert

TextBox.Text into .ToString()

because it TextBox.Text always return string datatype.

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Hi,

Your question is not clear. What is the issue which you are facing?

I can see one thing which can throw null reference error:

a.ToString()

this line will throw error when a is null. change it to:

Convert.ToString(a)

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