The best overloaded Method has some invalid arguments and Cannot convert type

Question

Banking object1 = new Banking(t1.Text);
MessageBox.Show(object1.transact(t2.Text));

It's giving an error of invalid arguments in the method and also that it cant convert from String to float. Banking is the class and object1 is an object, transact is a method. As long as I believe there is no error in the method still below I'm pasting my class and method code:

class Banking
    {   string bankName;
        float amount;

        public Banking(string name)
        {
            bankName = name;
        }
        public string transact(float a)
        {
            amount = a * 7 / 100;
            float total =Convert.ToSingle(amount + a);
            return "Your amount of Rupees : " + total + "has been deposited in " + bankName;
        }
    }

Here is the error list:

Error 1 The best overloaded method match for 'WindowsFormsApplication1.Banking.transact(float)' has some invalid arguments.

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Error 2 Argument '1': cannot convert from 'string' to 'float'

Answer 1

将值从字符串解析为浮点数。

MessageBox.Show(object1.transact(Single.Parse(t2.Text)));