Var Variable In C#

Var Variables:

·        Var variables are simply can be defined under the category of strongly Typed variables.

·        These Strongly typed variables are introduced in the version of 3.0.

·        These variables know the data type at the compile time or simply we can say before the run time. But basically, this will be identified by the value assigned for the variable

·        This type of variable can be called as inferred typed variable or can be defined as data type known at the compile time.

·        These variables once a value is assigned or its mandate to assign the value at the time of declaration

·        If assigned, then the type of variable cannot be changed like string to int or int to string etc.

·        Var variable cannot be defined Globally, can be used only inside methods or properties.

Syntax:

[Var] [variableName] = [assignment]

Example,

Invalid Example:

Valid Example:

       #region Var Variable in c#

        public class VarVariableDemo

        {

            public void callingMethod()

            {

                //Valid Declaration for var variable

                var validVariable = 10;

                StringBuilder stringBuilder = new StringBuilder();

                stringBuilder.AppendLine("==============Var variable Output Starts===============");

                stringBuilder.AppendLine($"Type of variable - {validVariable.GetType()}");

                stringBuilder.AppendLine($"Value for variable - { validVariable}");

                stringBuilder.AppendLine("================Var variable Output Ends==============");

                //prinitng values

                MessageBox.Show(stringBuilder.ToString());

            }

        }

        private void button9_Click(object sender, EventArgs e)

        {

            VarVariableDemo varVariableDemoObject = new VarVariableDemo();

            varVariableDemoObject.callingMethod();

        }

       

        #endregion

Output