Using ToString() Method:

The ToString() method is available on all objects in C# and provides a string representation of the object.

double myDouble = 42.567;
string myString = myDouble.ToString();
Console.WriteLine("Converted String: " + myString);

Output:

Converted String: 42.567

In this example, the ToString() method is called on the myDouble variable, resulting in a string representation of the double value.

String.Format() Method:

Another way to convert doubles to strings is by using the String.Format() method. This method allows for more control over the format of the resulting string.

double myDouble = 1234.5678;
string myString = string.Format("{0:F2}", myDouble);
Console.WriteLine("Formatted String: " + myString);

Output:

Formatted String: 1234.57

Here, the format specifier "{0:F2}" ensures that the double value is formatted with two decimal places.

Interpolation and Concatenation:

C# also supports string interpolation and concatenation for converting doubles to strings.

double myDouble = 9876.54321;
string myStringInterpolated = $"{myDouble:F3}";
string myStringConcatenated = "Value: " + myDouble;
Console.WriteLine("Interpolated String: " + myStringInterpolated);
Console.WriteLine("Concatenated String: " + myStringConcatenated);

Output:

Interpolated String: 9876.543
Concatenated String: Value: 9876.54321

In the above example, the $"{myDouble:F3}" syntax in the interpolated string ensures three decimal places.