I want to apply DateTime.Tostring("dd/MM/yyyy hh:mm:ss") to the left side of expression

for that I am using following code

 var variable = Expression.Variable(typeof(Report));

  MethodInfo method = typeof(DateTime).GetMethod("ToString", new[] { typeof(string) });

Expression ExprLeft = Expression.Call(Expression.Property(variable, oFC.Field), method,Expression.Parameter( typeof(string),"MM/dd/yyyy hh:mm:ss"));

But it is giving me error ,I guess I am using incorrect syntax to define method parameter.

Can you please provide me exact syntax to achieve this.

Expression.Constant("MM/dd/yyyy hh:mm:ss",typeof(string))

rather than Expression.Parameter().

Yes you are using the value as a parameter to be passed to the MethodCallExpression, but it isn't a parameter of the lambda, its just a constant string included in the expression tree.